| A | B | 
| abundance | unlimited amount,more than enough | 
| delta | land made of a silt left behind as river drains into a larger body of water | 
| desert | a dry environment with few plants and animals | 
| gulf | part of an ocean that extends into land;larger than a bay | 
| harbor | a sheltered place along a coast where boats dock safely | 
| island | a body of land completely surrounded by water | 
| isolation | separating from, setting apart | 
| isthmus | a narrow strip of land that connects two larger bodies of land | 
| lake | a body of water completely surrounded by land | 
| landlocked | completely surrounded by land | 
| monopoly | complete control over a good or service | 
| mountain | a high land form with steep sides; higher than a hill | 
| mouth | the place where a river empties into a larger body of water | 
| natural resources | natural things in our environment that help support life | 
| ocean | a large body of salt water; oceans cover most of the earth's surface | 
| peninsula | a large body of land nearly surrounded by water | 
| plain | a large area of nearly flat land | 
| plateau | an area of elevated flat land | 
| rainforest | a warm, wet forest that receives more than 80 inches of rain per year | 
| river | a stream of water that flows across the land and empties into a larger body of water | 
| rugged coastline | a strong outline of a body of water | 
| scarcity | limited amount, not enough | 
| sea | a great body of salt water | 
| source | the starting point of a river | 
| strait | a narrow waterway that connects two larger bodies of water | 
| valley | an area of low land between hills or mountains |