Unit 5 - natural environment

a low mountain or low hill at the bottom of a larger mountain or range of mountains:

• mountain

• hill

• foothill

a large mass of ice that moves slowly

• glacier

• ice cap

• peninsula

a piece of land completely surrounded by water:

• peninsula

• island

• desert

an area of low land between hills or mountains, often with a river running through it:

• river bank

• valley

• foothill

a wall built across a river that stops the river's flow and collects the water, especially to make a reservoir (= an artificial lake) that provides water for an area:

• dam

• watefall

• lake

a mountain with a large, circular hole at the top through which lava (= hot liquid rock) gases, steam, and dust are or have been forced out:

• mountain

• hill

• volcano

energy that is produced using the sun, wind, etc., or from crops, rather than using fuels such as oil or coal:

• solar panels

• renewable energy

• wind power

fuels, such as gas, coal, and oil, that were formed underground from plant and animal remains millions of years ago:

• water power

• glaciers

• fossil fuels

an increase in the amount of carbon dioxide and other gases in the atmosphere (= mixture of gases around the earth), that is believed to be the cause of a gradual warming of the surface of the earth:

• ozone hole

• melting ice caps

• greenhouse effect

a large amount of water covering an area that is usually dry:

• flood

• draught

• tsunami