FORCES ON EARTH UNIT 3.2. An investigation into how Newton s Laws of Motion are applied to the tectonic activity on Earth.
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1 FORCES ON EARTH UNIT 3.2 An investigation into how Newton s Laws of Motion are applied to the tectonic activity on Earth.
2 USE THESE NOTES:
3 OUR HOME PLANET EARTH: What do you know about our planet?
4 SO.HOW DO WE KNOW WHAT S INSIDE THE EARTH? Geologists record seismic waves and study how they travel through the medium of Earth. The speed and the path the waves take reveal how the planet is put together.
5 THE EARTH IS HOT, HOT HOT! The interior of the earth is hot. Convection currents are an unbalanced force in the mantle that cause heat flow and movement of material within the earth This results in plate movement that causes earthquakes and volcanic eruptions to create mountains and ocean basins. Let s take a closer look at our Earth
6 A JOURNEY TO THE CENTER OF THE EARTH The further in you go temperature and pressure both increase There are four main layers that make up the Earth s interior: Crust Mantle Core split into outer and inner core
7 THE CRUST The layer of rock that forms Earth s outer skin It consists of about 10 miles of rock Continental crust is thicker than oceanic crust However, oceanic crust is much denser than continental crust
8 THE MANTLE The mantle extends to a depth of approximately 1,800 miles It is made of a thick solid rocky substance composed of mostly silicates a wide variety of compounds that share a silicon and oxygen structure The uppermost part of the mantle and the crust together form a rigid layer called the lithosphere The asthenosphere is super-heated rock (molten) The remainder of the mantle is solid Upper mantel Lower mantel
9 Lithosphere (hard) Asthenosphere (soft) Mesosphere
10
11 THE CORE Consists of two parts Outer core molten iron and nickel metal Inner core solid dense ball of iron and nickel metal
12 HEAT TRANSFER (THE MOVEMENT OF HEAT) Heat is transferred through: Radiation Conduction Convection Let s go through what each type of heat is first, before we apply it to the Earth.
13 RADIATION Radiation transfer of energy by electromagnetic waves (ex. Sun heating the Earth)
14 CONDUCTION Conduction Conduction transfers heat via direct molecular collision. Occurs via physical contact. When you touch a pan that is on the stove, the fire's heat causes molecules in the pan to vibrate faster, making it hotter. The heat is transferred to your hand when you touch the handle.
15 CONVECTION Convection - The transfer of heat energy by movements of a fluid. (air, liquids and molten material are all considered fluid ) Heat moves (transfers) because the density of the fluid changes. Hot things are lighter. The fluid moves away from the heat source. Then by being away from the heat source, it begins to cool Again, it s density changes, it becomes heavier Heavy things sink, so it sinks back down, and it goes near the heat source again and the cycle repeats. Convection currents continue as long as heat exists!
16 CONVECTION IN THE MANTLE Heat from the Earth s core and from the mantle itself cause the convection currents in the mantle Convection currents are an unbalanced force that causes heat flow and the movement of material within the earth. This moving material results in earthquakes and volcanic eruptions to create mountains and ocean basins.
17 TECTONIC PLATES WHAT ARE THEY? The crust is broken into large pieces, which we call plates
18 PLATE MOVEMENT Plate movement result in stress within the Earth s crust which adds energy to rock until the rock either breaks or changes shape
19 PLATES AND FORCES (AND NEWTON S LAWS) Plates apply equal and opposite forces on each other. (A push or pull, shown by ) The acceleration of the plate depends on forces acting on the plate and the mass of the plate. nvection.htm
20 EFFECTS OF PLATE TECTONICS *There are several geological processes that occur where plates meet (at the plate edges): 1. Volcanoes tend to erupt at plate margins as a result of a process called subduction 2. Earthquakes occur where plates grind against or over one other 3. Mountain building occurs as one plate is pushed over another 4. Seafloor spreading occurs where two oceanic plates pull apart, makes ocean basins
21 THE 3 TYPES OF PLATE BOUNDARIES
22 CONVERGENT BOUNDARIES Convergent, means to come together. Convergent Boundaries are the boundaries between two plates that are converging, or moving towards each other. Earthquakes, island formation, mountain forming, and volcanoes all occur as the result of these plate collisions. The type of stress at this boundary is compression When two plates collide (converge) one plate moves under the other. This process is called subduction. There are three types of convergent boundaries
23 TYPES OF CONVERGENT BOUNDARIES Oceanic/oceanic Subduction occurs (you will add examples in a minute, leave enough space for that) Oceanic/continental Oceanic plate sinks under the less dense plate Continental/continental Equal density plates collide
24 WHAT CAN HAPPEN AT EACH BOUNDARY? Let s look at a few examples:
25 There are 3 types of convergent boundaries: 1. Convergent boundary of two oceanic plates. Forms an island arc and a trench. A trench is like a deep canyon, but in the ocean. Example: Japan
26 The most famous trench in the world: Mariana Trench
27 Convergent Boundary 2: Oceanic plate and a continental plate. Forms a volcanic mountain range and a trench. Example: Andes Mts
28 Convergent Boundary 3: Continental-Continental Convergent Boundary (also called a Collisional Boundary) Forms mountains - The convergent boundary of the Eurasian and Indian Plates has resulted in the formation of the highest mountain range in the world The Himalayas
29 This illustration shows the movement of the land mass known as India today. As it moved on the Indian plate through time, over millions of years, it finally collided with the Eurasian plate forming the Himalayan Mountains
30
31 Mount Everest is the tallest mountain in the world, at over 29,000 ft. and is part of the Himalayas. This is a result of the Eurasian and Indian Plates colliding and it is still getting higher as these two plates continue to collide.
32 DIVERGENT BOUNDARIES Divergent Boundaries are the boundaries between two plates that are diverging, or moving away from each other. The type of stress is tension Divergent, means to spread apart.
33 When plates are spreading apart from one another there is a lot of geological activity. Earthquakes and volcanoes can occur here. In some places like in East Africa, a rift valley can form that is hundreds of feet deep. Africa s Rift Valley
34 The Mid-Atlantic Ridge is one of the world s largest divergent plates, running North to South in just about the center of the Atlantic Ocean. All along this ridge, volcanic activity takes place and the sea floor is spreading East and West at a rate of 1.25 cm per year. Question: So what is happening on the other side of that same plate?
35 Another Example: Divergent Boundary Between the Eurasian and North American Plate
36 TRANSFORM FAULT BOUNDARIES Transform Boundaries are the boundaries between two plates that are sliding horizontally past one another. The type of stress is shear-stress Transform, means to slide past one another.
37 PLATES MOVE SIDE BY SIDE Transform boundaries neither create nor consume crust. Rather, two plates move against each other, building up tension, then releasing the tension in a sudden and often violent jerk. This sudden jerk creates an earthquake. Earthquakes in Austin
38 Strike Slip Faults There is a transform-fault boundary where the North American and Pacific plates are moving past each other. This is the: San Andreas fault in California
39 The San Andreas Fault, seen here, is the result of the Pacific Plate sliding past the North American Plate. This is the site of many of the earthquakes that occur in the United States
40 CHANGING EARTH S SURFACE Plate movement can alter Earth systems and produce changes in Earth s surface Deformation of the crust Faults Mountain building Land subsidence (lands sinks) Volcanoes
41 VOLCANOES A volcano is a weak spot in the crust where molten, rockforming magma comes to the surface Volcanic activity builds mountains made of lava rock and other volcanic materials
42 LOCATION OF VOLCANOES There are more than 600 active volcanoes on land and many more beneath the sea Volcanic belts form along the boundaries of Earth s plates. One major volcanic belt is the Ring of Fire
43 RING OF FIRE Ring of Fire very active region of subduction, where is it located? lcano.si.edu/p layers.cfm?pid =2
44 RECENT EARTHQUAKES AND VOLCANIC ERUPTIONS
45 WHAT ARE HOT SPOTS? All seismic activity occurs along plate boundaries (except for hotspots) Magma rises through the mantle forming an active volcano The plate moves over this spot forming a chain of islands with the active volcano being the one over the hot spot Hot Spot Volcanoes
46 EARTH S INTERIOR G.O.
47 WEB-QUEST! Get a computer and begin working on the web-quest. Follow the questions and it will lead you through the online activities. When is this due?? (You will have next class to work on this as well)
48 WEB-QUEST! Get a computer and begin working on the web-quest. Follow the questions and it will lead you through the online activities. When is this due?
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