Crissy Field Rocks! Crissy Field Center Community Group Programs A Partnership of: National Park Service Golden Gate National Parks Conservancy Presidio Trust 1
Group Leader Pre-Visit Packet Crissy Field Rocks! Here are some activities that you may find useful in preparing your group for their visit or to follow-up after the program. Please feel free to use only the activities you feel are most appropriate and convenient for your group and curriculum schedule. Objectives: 1. Recognize three rocks/minerals found within the Golden Gate National Recreation Area s (GGNRA) Presidio (serpentinite, chert, and sandstone) 2. Compare and contrast physical characteristics between serpentinite, chert, and sandstone. 3. Work cooperatively in groups with a microscope to identify the three rocks in the program. This Packet Includes: 1. Key Vocabulary (for younger and older students) 2. Activities and Other Resources for Students a. Short Text on geology of the Golden Gate National Recreation Area to share with students b. Rock identification card c. Fill-in-the-Blank Activity on the geology of the Golden Gate National Recreation Area (ages 8-10) d. Answer Key to Fill-in-the-Blank Activity e. Crossword Puzzle using key vocabulary (ages 6-7) f. Answer Key to Crossword Puzzle g. Word Search using key vocabulary (ages 3-5) h. Answer Key to Word Search 2
Crissy Field Rocks! Vocabulary (for older students) 1. Erosion a process where the Earth s surface is worn away by the action of wind, water, or glaciers 2. Tectonic Plate two layers of the earth s crust that can form mountains or cause earthquakes 3. Microscope a tool with a magnifying lens used to observe objects that are too small to see with the naked eye 4. Serpentinite the California state rock; a blue-colored rock formed with the heating of the Earth s crust or with movement of different layers of crust 5. Chert a red-colored rock that contains quartz (a crystallike substance) 6. Sandstone a brown sedimentary rock which is formed when many layers of sand and rock are pressed together with a lot of heat 7. Sediment rock matter that is left by the movement of water, ice, or air 8. Geology the study of rocks and how their movements have shaped the Earth 3
Crissy Field Rocks! Vocabulary (for younger students) 1. Rock a stone; mountains are made out of a group of rocks 2. Mountain a large rock feature found in nature 3. Valley a dip in between two mountains 4. Crissy Field a field located in a National Park (the Golden Gate National Recreation Area) 5. Microscope an object with a special lens that is used to look at objects that are so small that we can t see them with just our eyes 6. Science facts about the world around us (Why is the sky blue? What are mountains made of? These questions are answered using science) 7. Earth the planet where we live 8. Observe to look or examine the world around us 4
Crissy Field Rocks! Geology of Crissy Field Looking at rocks at Crissy Field can tell us a lot about how the Earth was formed. Scientists who ask these kinds of questions are part of the field of geology. They study rocks to answer questions about how mountains were formed or how oceans were made. Did you know that thousands of years ago there was no water in the San Francisco Bay? It was just a valley and Angel Island and Alcatraz were small hills. Imagine that! There are three very special rocks at Crissy Field. The California state rock, serpentinite, is blue colored and is formed when other rocks are moved around by the earth s crust. Special layers of the Earth s crust called tectonic plates do a lot of this moving. Sometimes when these layers run into each other, mountains are formed, and they sometimes even cause earthquakes. Over time, mountains are worn down by wind and water through a process called erosion. This is why we have hills and mountains of different sizes. Older mountains are usually shorter than newer mountains. The other two rocks are both formed when layers of sediment which includes sand and smaller rocks builds up over time. Chert is a reddish rock that can be seen all over the Marin Headlands (right across the Golden Gate Bridge). Sandstone is formed when layers of sand pile onto each other. If you use a microscope, you can even see little bits of sand in this rock. By looking at rocks, we can learn a lot about the world around us. What kind of questions do you have? Maybe rocks can answer those questions! Source: National Park Service 5
Crissy Field Rocks! Rock Identification Card Serpentinite This rock is the California state rock. Serpentinite is a metamorphic rock which means that it is formed through the transformation or change of other rocks when they are heated up or when they are moved by the Earth s crust. Source: Wikimedia Commons Chert Chert is a reddish rock found in much of the Marin Headlands (right across the Golden Gate Bridge). Chert is a sedimentary rock which means that it is formed when layers and layers of sand and other rock settle and build up over time. Source: Wikimedia Commons Sandstone Sandstone is a brown rock. It is also a sedimentary rock because it is formed through the buildup of sand and smaller particles. Source: Wikimedia Commons 6
Crissy Field Rocks! Fill-In-the-Blanks Activity Directions: Use the word bank to fill in the blanks in the following paragraph. Remember to use context clues to help complete the assignment. Looking at rocks at Crissy Field can tell us a lot about how the Earth was formed. Scientists who ask these kinds of questions are part of the field of. They study rocks to answer questions about how mountains were formed or how oceans were made. Did you know that thousands of years ago there was no water in the San Francisco Bay? It was just a valley and Angel Island and Alcatraz were small hills. Imagine that! There are three very special rocks at Crissy Field. The California state sediment rock,, is blue colored and is formed when serpentinite other rocks are moved around by the earth s crust. Special layers of the Earth s crust called do a lot of this tectonic plate moving. Sometimes when these layers run into each other, mountains are formed, and they sometimes even cause earthquakes. Over time, mountains are worn down by wind and water through a process called. This is why we have hills and mountains of different sizes. Older mountains are usually shorter than newer mountains. The other two rocks are both formed when layers of which includes sand and smaller rocks builds up over time. is a reddish rock can be seen all over the Marin Headlands (right across the Golden Gate Bridge). is formed when layers of sand pile onto each other. If you use a, you can even see little bits of sand in this rock. By looking at rocks, we can learn a lot about the world around us. What kind of questions do you have? Maybe rocks can answer those questions! WORD BANK chert erosion geology microscope sandstone Source: National Park Service 7
Crissy Field Rocks! Fill-In-the-Blanks Answer Key Directions: Use the word bank to fill in the blanks in the following paragraph. Remember to use context clues to help complete the assignment. WORD BANK Looking at rocks at Crissy Field can tell us a lot about how the Earth was formed. Scientists who ask these kinds of questions are part of the field of GEOLOGY. They study rocks to answer questions about how mountains were formed or how oceans were made. Did you know that thousands of years ago there was no water in the San Francisco Bay? It was just a valley and Angel Island and Alcatraz were small hills. Imagine that! There are three very special rocks at Crissy Field. The California state rock, SERPENTINITE, is blue colored and is formed when other rocks are moved around by the earth s crust. Special layers of the Earth s crust called TECTONIC PLATES do a lot of this moving. Sometimes when these layers run into each other, mountains are formed, and they sometimes even cause earthquakes. Over time, mountains are worn down by wind and water through a process called EROSION. This is why we have hills and mountains of different sizes. Older mountains are usually shorter than newer mountains. chert erosion geology microscope sandstone sediment serpentinite tectonic plate The other two rocks are both formed when layers of SEDIMENT which includes sand and smaller rocks builds up over time. CHERT is a reddish rock that can be seen all over the Marin Headlands (right across the Golden Gate Bridge). SANDSTONE is formed when layers of sand pile onto each other. If you use a MICROSCOPE, you can even see little bits of sand in this rock. By looking at rocks, we can learn a lot about the world around us. What kind of questions do you have? Maybe rocks can answer those questions! 8
Name Complete the crossword puzzle. Crissy Field Rocks! Date (Key # 1-584020) 1 2 3 4 5 6 7 8 Across 3 The great chunks of the earth's crust that push against each other and cause earthquakes. (2 words) 4 An instrument to view tiny objects. 6 a red-colored rock found in the Marin Headlands 7 the wearing away and removal of rock and soil caused by such forces as wind and flowing water. 8 Rock that is formed from grains of sand. Down 1 The study of earth's history as revealed in the rocks that make up the earth 2 the California state rock; blue-colored rock with a name that sounds like another word for "snake" 5 Sand and stones deposited by water, wind, or a glacier.
Answer Key: Key # 1-584020 Complete the crossword puzzle. Crissy Field Rocks! 1 G 2 S 3 T E O C T O N I C P L A T E R L 4 M I C R O S C O P E O G 5 S Y 6 C H E D R 7 E R O S I M O 8 S A N D S T O N E N T E N T I N I T E
Name Date (Key # 1-933612) Crissy Field Rocks! Word Search E R O S E D I M E N T N N E T T N O G O C G E O L O G Y E E S S E C H E R O S I O N C C R E P G E O L O G Y E I T T C E R E R O S I O N E C O O M S R P T O C H E R T O N N I S A O E G E O L O G Y I I C E A N S N E C H E R I C C R E R N D I T C H I R T P P O R T O D S O I H E S R L L S O T P S S T N N E R D A A C S N S O S T O T I R T T T O I E R O S I O N N T T E E P O C H E R T O N E O E N T E N T T P N O N N E T T
Name Date (Key # 1-933612) Use the clue to figure out the word. Write the word and find the word in the word search puzzle. 1. The study of earth's history as revealed in the rocks that make up the earth 7. a red-colored rock found in the Marin Headlands 2. Rock that is formed from grains of sand. 8. Sand and stones deposited by water, wind, or a glacier. 3. The great chunks of the earth's crust that push against each other and cause earthquakes. 4. An instrument to view tiny objects. 5. the California state rock; blue-colored rock with a name that sounds like another word for "snake" 6. the wearing away and removal of rock and soil caused by such forces as wind and flowing water.
Crissy Field Rocks! Word Search Answer Key: Key # 1-933612 E R O S E D I M E N T N N E T T N O G O C G E O L O G Y E E S S E C H E R O S I O N C C R E P G E O L O G Y E I T T C E R E R O S I O N E C O O M S R P T O C H E R T O N N I S A O E G E O L O G Y I I C E A N S N E C H E R I C C R E R N D I T C H I R T P P O R T O D S O I H E S R L L S O T P S S T N N E R D A A C S N S O S T O T I R T T T O I E R O S I O N N T T E E P O C H E R T O N E O E N T E N T T P N O N N E T T
Answer Key: (Key # 1-933612) Use the clue to figure out the word. Write the word and find the word in the word search puzzle. 1. The study of earth's history as revealed in the rocks that make up the earth 7. a red-colored rock found in the Marin Headlands C H E R T G E O L O G Y found 3 time(s) in the puzzle 2. Rock that is formed from grains of sand. S A N D S T O N E found 2 time(s) in the puzzle found 5 time(s) in the puzzle 8. Sand and stones deposited by water, wind, or a glacier. S E D I M E N T found 1 time(s) in the puzzle 3. The great chunks of the earth's crust that push against each other and cause earthquakes. T E C T O N I C P L A T E found 1 time(s) in the puzzle 4. An instrument to view tiny objects. M I C R O S C O P E found 1 time(s) in the puzzle 5. the California state rock; blue-colored rock with a name that sounds like another word for "snake" S E R P E N T I N I T E found 1 time(s) in the puzzle 6. the wearing away and removal of rock and soil caused by such forces as wind and flowing water. E R O S I O N found 5 time(s) in the puzzle