Chapter 2 Planet Earth
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1 Chapter 2 Planet Earth Section Notes Earth and the Sun s Energy Water on Earth The Land Close-up The Water Cycle World Almanac Major Eruptions in the Ring of Fire Quick Facts Chapter 2 Visual Summary Video Impact of Water on Earth Maps Ring of Fire Earth s Plates India: Physical Physical Map Images Solar Energy The Seasons: Northern Hemisphere Plate Separation Plate Collision Mount Saint Helens Eruption
2 Earth and the Sun s Energy The Big Idea Earth s movement and the sun s energy interact to create day and night, temperature changes, and the seasons. Main Ideas Earth s movement affects the amount of energy we receive from the sun. Earth s seasons are caused by the planet s tilt.
3 Main Idea 1: Earth s movement affects the amount of energy we receive from the sun. All life on Earth requires solar energy, or energy from the sun, to survive. Amount of solar energy received changes constantly Earth s rotation, revolution, tilt, and latitude all affect the amount of solar energy Earth receives.
4 Rotation and Revolution Rotation Earth spins on its axis an imaginary line that runs through the center of the planet around which it turns. It takes Earth 24 hours to make one rotation, or complete spin on its axis. As Earth spins, different parts of the planet face the sun, thus causing the changes from day to night. Revolution Earth follows an orbit, or path, around the sun. Orbit is not a perfect circle. It takes Earth 365¼ days to complete one revolution, or trip around the sun. Our calendar year is based on the time it takes Earth to complete its orbit.
5 Tilt and Latitude Tilt Earth s axis is tilted at an angle of 23½ degrees from vertical. At any give time of year, some places on Earth tilt toward the sun, and others tilt away. Places tilting toward the sun receive more solar energy and have warmer temperatures than those that tilt away. Latitude Latitude is the distance north or south of Earth s equator. Low-latitude areas, those nearest the equator, receive direct rays from the sun all year. High-latitude areas, those farther from the equator, receive indirect rays from the sun and have colder temperatures.
6 Main Idea 2: Earth s seasons are caused by the planet s tilt. Seasons are periods during the year that are known for a particular type of weather. Many places experience four seasons winter, spring, summer, and fall. In some parts of the world, seasons are based on the amount of rainfall
7 Winter and Summer Earth tilts away from sun in winter and towards the sun in summer. Because of the Earth s tilt, the Northern and Southern hemispheres experience opposite seasons. The Seasons Spring and Fall In spring, Earth begins to tilt toward sun, solar energy increases, temperatures rise, and days grow longer. In fall, the opposite occurs. Rainfall and Seasons In the tropics, regions close to the equator, seasons are marked by rainfall rather than temperature. At certain times of year, winds bring either dry or moist air to the tropics, creating wet and dry seasons.
8 Water on Earth The Big Idea Water is a dominant feature on Earth s surface and is essential for life. Main Ideas Salt water and freshwater make up Earth s water supply. In the water cycle, water circulates from Earth s surface to the atmosphere and back again. Water plays an important role in people s lives.
9 Main Idea 1: Salt water and freshwater make up Earth s water supply. Earth s Water Water covers some two-thirds of the planet. About 97 percent of the Earth s water Salt Water Freshwater Unsafe to drink because of high levels of salt In general, found in Earth s oceans, which cover some 71 percent of the planet s surface Also found in some of Earth s lakes Water without salt Makes up only 3 percent of our water supply
10 Freshwater Much of Earth s freshwater is locked in glaciers, large areas of slow moving ice, and in the ice of the Arctic and Antarctic regions. Surface water is water that is found in Earth s streams, rivers, and lakes. Less than one percent of Earth s water supply Streams, rivers, and lakes are common sources. Precipitation is water that falls to Earth s surface as rain, snow, sleet, or hail. Streams form when precipitation collects in a narrow channel and flows toward the ocean. Most available freshwater is groundwater, water found below Earth s surface. Some naturally bubbles from the ground to the surface as a spring. Most obtained by digging wells
11 Main Idea 2: In the water cycle, water circulates from Earth s surface to the atmosphere and back again. Water is the only substance on Earth that occurs naturally as a solid, a liquid, and a gas, or water vapor. The water cycle is the movement of water from Earth s surface to the atmosphere and back ; it is driven by the sun s energy. Evaporation water turns from liquid to gas. Condensation the rising gas cools and condenses, or changes from a vapor into tiny liquid droplets, to form clouds. Precipitation if the droplets in clouds become heavy enough, they fall back to Earth as rain, snow, sleet, or hail. Runoff excess water that isn t absorbed as groundwater flows over land and collects in streams, rivers, and oceans.
12 Main Idea 3: Water plays an important role in people s lives. Water Problems Lack of available freshwater, which can be caused by droughts or overuse Contaminated, or polluted, water can harm humans, plants, and animals. Flooding can damage property and threaten lives. Water Benefits Provides us with food to eat Important source of energy Provides us with recreation, including swimming, fishing, surfing, and sailing
13 The Land The Big Idea Processes below and on Earth s surface shape the planet s physical features. Main Ideas Earth s surface is covered by many different landforms. Forces below Earth s surface build up our landforms. Forces on the planet s surface shape Earth s landforms. Landforms influence people s lives and culture.
14 Main Idea 1: Earth s surface is covered by many different landforms. Landforms, or shapes on the planet s surface, make up the landscapes that surround us. Earth s surface is covered with landforms of many different shapes and sizes. Mountains, land that rises higher than 2,000 feet Valleys, areas of low land located between mountains or hills Plains, stretches of mostly flat land Islands, areas of land completely surrounded by water Peninsulas, land surrounded by water on three sides
15 Main Idea 2: Forces below Earth s surface build up our landforms. Earth s Plates The planet s continents, or large landmasses, are part of Earth s crust the solid outer layer of the planet. Theory of plate tectonics suggests that Earth s surface is divided into a dozen or so slow-moving plates, or pieces of Earth s crust. Movement of Continents The idea that continents have traveled great distances over millions of years is known as continental drift. Theory, developed by Alfred Wegener, states that the continents were once united in a single supercontinent and over time, slowly separated and moved to their present positions. As plates collide, separate, and slide, they shape Earth s landforms
16 Plates Collide, Separate, and Slide Plates Collide Two ocean plates: one pushes under the other, creating ocean trenches, or deep valleys in ocean floor Ocean and continental plate: ocean plate drops beneath continental plate, forcing land above to crumple and form mountain range Two continental plates: land pushes up to form mountains Plates Separate As plates move apart, gaps between plates allow magma to rise to Earth s crust. Lava, magma that reaches the Earth s surface, emerges from the gap. As lava cools, it builds a mid-ocean range, or underwater mountain, that can rise above the surface of the ocean to form islands. Plates Slide As plates pass by each other, they sometimes grind together, producing earthquakes, sudden, violent movements of Earth s crust. Earthquakes often take place along faults, or breaks in Earth s crust where movement occurs. The region around the Pacific plate, called the Ring of Fire, is home to most of the world s earthquakes and volcanoes.
17 Main Idea 3: Forces on the planet s surface shape Earth s landforms. Weather, water, and other forces change Earth s landforms by wearing them away or reshaping them. Weathering is the process by which rock is broken down into smaller pieces called sediment. Heating and cooling can cause rocks to crack. Expansion of water as it freezes can cause cracks to expand. Roots of trees can pry rocks apart. Erosion is the movement of sediment from one location to another. Can wear away or build up landforms
18 Wind Erosion Types of Erosion Glacial Erosion Water Erosion Winds lift sediment into air and carry it across great distances. On beaches and in deserts, deposits can form dunes. Blowing sand can wear down rock. Glaciers, or large, slow-moving sheets of ice, erode the land by carving valleys and mountain peaks. Crush rock into sediment and move it great distances Waves and flowing water can cut through rock, carry sediment, and deposit sediment in new locations. Floodplains are created when rivers flood their banks and deposit sediment. Sediment carried by a river all the way to the sea creates a delta.
19 Main Idea 4: Landforms influence people s lives and culture. Landforms can influence where people settle. Landforms often influence what jobs are available in a region. Landforms can affect language. People sometimes change landforms to suit their needs.
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