1. Chapter 2
Planet Earth

2. Solar Energy Energy from the sun. Why? Need for survival.
Amount of energy received, changes.
Why?

3. Rotation One complete spin of the earth.
Takes 24 hours.
Rises in the east, sets in the west.
The sun does not move.

4. Revolution Earth spins on its axis.
While earth revolves around the sun.
Takes days for a complete revolution.
Calendar year.
Leap year?

5. Tilt
Earth is tilted 23.5 degrees.
Seasons?

6. Equator
Line across center of earth. That divides the world north and south.

7. Latitude
The distance north and south of Earth’s equator.

8. Prime Meridian
Line of Longitude at 0 degrees.

9. Longitude
The distance east and west of Earth’s prime meridian.

10. The Seasons Many places on earth experience four seasons.
Winter, Summer, Fall, and Spring.
Seasons are based on temperature, and length of days.
Some seasons are based on rain fall.

11. Winter and Summer Changes in seasons are based on the earth’s tilt.
During winter the earth is tilted away from the sun.
During summer earth is tilted toward the sun.
The northern and southern hemispheres experience opposite seasons.

12. Spring and Fall
First day of spring and fall, the earth does not tilt toward the sun.

13. Rainfall and Seasons
Some areas in the world mark their seasons by rainfall.
Tropics are regions close to the equator.
Winds will either bring dry or wet air to the region.
Seasons become known as wet or dry.

14. Salt Water 97% of earths water is salt water.
Water covers 71% of earth.

15. Freshwater 3% of our water supply. Water used to sustain life.
Most of the fresh water are in glaciers.
Surface water is found in streams, rivers, and lakes.
Less than 1 percent comes from surface water.

16. continued
Groundwater is found under earth’s surface.

17. Precipitation Water that falls to earth’s surface.
Rain, snow, sleet, or hail.

18. Water Cycle
Water cycle is the movement of water from Earth’s surface to the atmosphere and back.

19. Earth’s plates Solid inner core, mantle, and crust.
Three layers of earth.
Earth’s continents are apart of earth’s crust.
Plate tectonics- Slow moving plates, or pieces of earth’s crust.

20. Continued
Ocean plates
Continental plates
What do they mean?

21. Plate Tectonics
Earth’s surface is divided into a dozen or so slow-moving plates.
Pieces of earth’s crust.
Plates move up to several inches per year.
Continental Drift

22. Plates Collide
Ocean Trenches are formed when two ocean plates collide, and one of them goes under the other one.
When an ocean plate and continental plate collide it results in mountain building.

23. Plates Separate When plates move apart, gaps allow magma to rise.
Lava-Magma that reaches the earth’s surface.

24. Plates Slide
Earthquakes-are sudden, violent movements of Earth’s crust.
Take place along earth’s faults.
Breaks in the crust

25. Ring of Fire Region around the Pacific Plate.
Produces violent earthquakes and volcanic eruption along the edges.

26. Weathering
Process by which rock is broken down into smaller pieces.

27. Erosion
Movement of sediment from one location to another.