KEY
1. Water that is stored in layers of soil and rock beneath Earth’s surface is called _____________.
groundwater
2. The water and human wastes that are washed down sinks, toilets, and showers are called _____________.
sewage
3. Chemicals that kill crop-destroying organisms are known as
_____________.
pesticides
4. Water that causes erosion picks up _____________, sediments or particles of rock and sand.
5. Most water pollution is the result of ________________ human activities.
6. _________ Rain washes agricultural wastes, including animal wastes, fertilizers, and pesticides, into ponds, causing algae to grow.
7. ____________ Wastes produced by agriculture, households, industry, mining, and other human activities can end up in water.
8. _______________ is stored in soil and rock beneath the Earth’s surface.
9. Most communities treat ___________ sewage before returning it to the environment.
10. Some wetlands dry up during long, hot summers and fill up during
_____________.
spring rains
11. Sometimes called the “River of Grass,” _____________ Everglades is a vast wetland.
12. A pocosin is a type of _____________ bog or swamp on a hill .
13. A wetland that contains both fresh water and salt water is a _____________ coastland wetland .
14. Wetlands affect climates by making them more _____________ moderate or mild .
15. Two important roles of wetlands are to control floods and act as _____________ filters .
16.
What wetlands would have large numbers of cattails and other grasslike plants?
marshes __________________
17.
Where would mangrove trees most likely be found growing? coastal wetlands
_____________________________

18. Which wetland would have a great many trees and be in a humid climate? swamp
19. What are the three types of boundaries between Earth’s tectonic plates? _________________________ convergent, divergent, transform
20. Why are convection currents in the mantle responsible for reshaping
Earth’s surface? _____________________________________ They cause the tectonic plates to move.
21. Explain what causes earthquakes.________________________ Earthquakes are caused by two transform plates whose jagged edges suddenly unlock from each other.
22. Explain how volcanoes are formed .____________________________ Volcanoes are formed when two convergent plates collide. One plate sinks under the other one and melts into magma. Later, the magma rises to the surface in the form of a volcanic mountain.
23. Explain how ocean basins are formed.____________________________ Ocean basins are formed, over time, when two divergent plates move away from each other.
24. Which changes to Earth’s surface happen slowly? Which happen
quickly? There are four. ____________________________________ The formation of mountains, ridges, and ocean basins happens slowly. Earthquakes and volcanic eruptions happen suddenly.
25. Tectonic plates make up Earth’s _________________________ biosphere