Weather Chapter 1

Earth’s atmosphere is important to living things because it

• contains dust.

• is very thin compared to the size of Earth.

• provides all the gases needed.

• creates extreme humidity.

Earth’s atmosphere traps energy from the sun, which

• allows water to exist as a liquid.

• allows solar radiation to penetrate to the surface.

• allows ozone to form easily.

• causes meteors to burn up.

The two most abundant gases in the atmosphere are

• carbon dioxide and oxygen.

• carbon dioxide and nitrogen.

• nitrogen and oxygen.

• nitrogen and hydrogen.

Most pollution in the atmosphere comes from

• pollen.

• forest fires.

• volcanic eruptions.

• burning fossil fuels.

Air in the atmosphere has pressure because

• the stratosphere is thick.

• air has mass.

• wind moves the air.

• temperature warms the air.

The less mass in a given volume of air, the

• more the air weighs.

• greater the air pressure.

• more dense the air.

• less dense the air.

Instruments used to measure air pressure are called

• thermometers.

• hygrometers.

• hydrometers.

• barometers.

As you rise farther in the atmosphere, air pressure

• increases.

• decreases.

• doesn't change.

• first increases, then decreases.

The layer in our atmosphere in which weather occurs is the

• troposphere.

• mesosphere.

• stratosphere.

• exosphere.

The air pressure acting on the top of a mountain

• comes from the air only within a few feet of the mountain top.

• is greater on top of the mountain than at the bottom.

• comes from all the air above the mountain.

• is the same at the top of the mountain and the bottom.