7th Grade Semester Review

Select the best definition for "Air" according to science

• A current of wind, a force.

• A mixture "bouncing" molecules, such as Oxygen, Carbon Dioxide and Nitrogen.

• Air is made of only one molecule, also called "Air Molecules"

Select the best definition of "Temperature", according to Science

• How fast the molecules are moving

• How hot or cold something is

• How bad something burns when I touch it

• How strong something is

If you go up in altitude (climb the mountain), what happens to the density of the molecules in the air?

• Goes up

• Goes down

• Stays the same

If you go up in altitude (climb the mountain), what happens to the air pressure? (Also called atmospheric pressure or barometric pressure)

• Goes up

• Goes down

• Stays the same

What happens to the oxygen molecules as altitude increases?

• Fewer molecules (Less density)

• More molecules (Greater density)

• Same amount of molecules

• Nacho Molecules

When you heat air molecules up, consequently density goes ___

• Down

• Up

When you cool down air molecules, air density goes ____

• Down

• UP

Tags

NGSS.MS-PS1-4

Pressure is the effect of

• the weight of all the air above pressing down
• water vapor in the atmosphere
• greenhouse gases
• solar radiation

Tags

NGSS.MS-ESS2-5

What happens to the oxygen molecules as altitude increases?

• fewer molecules
• more molecules
• same amount of molecules
• nothing happens to the molecules

Sometimes when traveling in an airplane your ears may pop, why?

• your eardrum busted

• as the airplane goes up it gets colder.

• the humidity decreased

• the change in altitude effected air pressure