Cell is a basic unit of all living things Life processes

Sediments are materials that are dropped by the agents of erosion

The dropping of sediments by the agents of erosion is called deposition

The sediments form a fan-shaped landmass called a delta

During ice ages, the land was covered by large, show-moving masses of ice

called glaciers

13. 
    The deposition of wind-carried sand causes piles of sand, called sand-dunes
    
14. 
    Something that blocks the force of the wind is called a wind-break
    

CHAPTER 10

1. 
   A natural resource is a useful material found in or on the earth
   
2. 
   A renewable resource is one that can be replaced after it is used
   
3. 
   Pollution is the presence of waste or other unwanted materials in a resource
   
4. 
   The substances that cause pollution are called pollutants
   
5. 
   Weak acids fall to the ground as a snow or rain. They are called acid rain
   
6. 
   Most smog is a mixture of a smoke and fog
   
7. 
   A fertilizer is a substance that helps plants grow
   
8. 
   The dumping of heated material into water is called thermal pollution
   
9. 
   Toxic wastes are wastes that are poisonous
   
10. 
    Biodegradable materials are materials that decay, or are broken down by
    

living things

11. 
    Materials that are not broken down by living thing are called
    

nonbiodegradable materials

Chapter 11

1. 
   Movement of air from water to land is called a sea breeze
   
2. 
   Movement of air from land to water is called a land breeze
   
3. 
   An air mass is a large body of air that has about the same temperature
   

and moisture throughout

4. 
   The place where two air masses meet is called a front
   
5. 
   A cold front is a place where a cold air mass moves into a warmer air mass
   
6. 
   A warm front is the place where a moving warm air mass meets
   

colder air mass

7. 
   The large fluffy white clouds often seen during fair weather are called