Earth's Composition, Equilibrium, Atmosphere

The most abundant (plentiful) gas in the atmosphere at 78% is:

• hydrogen

• oxygen

• nitrogen

• helium

As altitude increases, air pressure

• decreases

• increases

• stays the same

As altitude increases, density

• increases

• decreases

• stays the same

Density is a measure of

• the pressure of air in a given space

• how tightly packed together molecules are in a given space

• the pull of gravity in a given space

The layers of the atmosphere are classified according to changes in

• temperature and air pressure

• altitude and air quality

• humidity and temperature

• air pressure and oxygen

Which picture illustrates the lowest density and therefore the exosphere?

• Left A

• Middle B

• Right C

What is the second most abundant gas in the atmosphere at 21%?

• Nitrogen

• Oxygen

• Helium

• Hydrogen

Air pressure is

• How much air there is in the atmosphere

• The weight of air pressing on a given space

• The percent of oxygen in the air

• The movement of air in a given space

The troposphere is the densest layer of the atmosphere because of

• Earth's gravity pulling the air molecules down towards Earth.

• Because of the sun's energy force

• Because of all the pollution on Earth

• Because of all the people on Earth

Tags

NGSS.MS-ESS2-6

Which picture represents the density of the troposphere?

• Left A

• Middle B

• Right C