The earth is continuously changing. Many factors cause these changes. View this powerpoint to learn more about the earth and these factors.

1. True or False: The Earth’s surface has stayed the same for thousands of years

2. True or False: The Earth’s surface has stayed the same for thousands of years False The Earth’s surface is always changing!

7. Weathering and Erosion Wind Water Ice Gravity

9. Water causes weathering What evidence of weathering do you see in this picture?

10. Wind causes weathering What evidence of weathering do you see in this picture? Why wasn’t this mass of land weathered away?

11. Ice causes weathering Describe how ice causes weathering?

15. Wind Erosion Creates sand dunes Greatest impact in deserts Removes fertile topsoil

19. Ice Causes Erosion Glaciers wear down the landscape; by picking up and carrying debris that moves across the land along with the ice.

24. Plants CAN CAUSE weathering

25. Plants CAN PREVENT erosion

28. Canyons This simple animation provides you with a visualization of how the Colorado River has "downcut" into the rock layers of the Grand Canyon. How long it took to carve the Grand Canyon is debated by geologists. Some estimates are between 6 and 8 million years, which is very recent by comparison. Canyons are large valleys created by a river or stream.

29. Meanders Meandering streams wander side to side as they constantly seek out the lowest elevation. This constant motion creates a series of S-shaped “loops”.

30. Meanders Stream Velocity varies from one side to the other side of the “S”, resulting in erosion in some places and deposition of sediments in others.