Study Guide 4

The gas that makes up most of the atmosphere is __________.

• oxygen

• carbon dioxide

• nitrogen

• helium

Water covers ______% of Earth's surface.

• 50

• 62

• 71

• 86

The system which provides water to agricultural crops is known as ________.

• irrigation

• mitigation

• ground water

• aquafer

Most freshwater is used to irrigate crops.

• True

• False

The major water problem in the eastern United States is too little precipitation.

• True

• False

The continent of Africa has the most countries with chronic water shortages.

• True

• False

Which is a biomass fuel?

• Solar

• Wind

• Animal Waste

• Natural Gas

Which is a renewable resource?

• Coal

• Oil

• Wind

• Natural gas

Put these fuels in order from the smallest percentage of carbon (top) to the largest percentage of carbon (bottom): lignite, peat, anthracite, bituminous.

A population that is at the carrying capacity for its environment is in __________.

• A. equilibrium

• B. collapse

• C. growth

• D. decline