A valuable mineral deposit is located just below the surface of the ground. Which method would be used to obtain the mineral?

____________________________

Strip mining

The area of land that supplies water to a river system is called

a(n)____________________________

watershed

Using land to grow food crops is an example of____________________________.

agriculture

What is eutrophication?

Over many years, the levels of nutrients in a lake build up in this

process.

This is an example of how human activities may harm the balance in an ecosystem?

Desertification, urbanization, deforestation

.Which indoor air pollutant is a colorless, odorless gas that forms when wood, coal, oil,

or gas are incompletely burned?

ChlorofluorocarbonsCFC’S

One of the acids in acid rain forms when water combines with________.

NITROGEN OR SULPHUR OXIDES

What is a major role of technology in controlling air pollution?

Reducing emissions

A well in which groundwater rises because of pressure is called a(n)_____.

Artesian well

The process of restoring an area of land to a more natural, productive state is called ______________________

Land reclamation

. The water in ponds and lakes is

still

A river system is made up of a river and its____.

tributaries

Water moves easily through __________materials.

permeable

People can obtain groundwater by drilling a well _________.

Into an aquifer

An aquifer is a(n)

Underground layer of rock or sediment that holds water.

The streams and small rivers that feed into a main river are called

tributaries

The type of molecule that is the major cause of the ozone hole and blocks the ozone cycle is called____.

chlorofluorocarbons

Farmers may leave fields unplanted or plant alternate crops to reduce

Nutrient depletion

A(n) _____ is a dangerous weather condition in which a layer of warm air traps smog close to Earth's surface.

Temperature inversion

Many uses of land, including logging, mining, and farming, expose the soil, which can lead to_______.

erosion

The small lake that forms when a loop of a river is cut off from the main channel is called a(n) _______.

Oxbow lake

People may not have enough water during a(n) ___________________, a period when rainfall is below normal.

drought

Building a highway is an example of the type of land use known as ____________________.

development

.Scientists think deforestation is one cause of ______, because carbon dioxide increases when people burn trees to clear land.

Global warming

A radioactive gas that is naturally formed by certain types of rocks underground is called _________.

radon

A river and all of its tributaries make up a(n) ___________.

River system

The main chemical in photochemical smog is _____, which forms when sunlight reacts with certain gases.

ozone

The top of the saturated zone is called the _____.

Water table

The area of soil in which the pores are totally filled with water is called the _______ zone.

saturated

People cannot use most of the freshwater on Earth because it is in the form of ___________.

ice