Air Composition, Density, Pressure

Which of the following gases is NOT a significant component of the planet's atmosphere?

• oxygen

• nitrogen

• neon

• none of the above

Answer explanation

Oxygen and nitrogen are significant components of the Earth's atmosphere.

The layer of gases above Earth's surface is called the __________.

• atmosphere

• lithosphere

• biosphere

• hemisphere

Answer explanation

An atmosphere is the layers of gases surrounding a planet or other celestial body.

The two major atmospheric gases are _____.

• oxygen and helium

• nitrogen and carbon

• oxygen and carbon dioxide

• nitrogen and oxygen

Answer explanation

Two major atmospheric gases are oxygen and nitrogen! Nitrogen and oxygen make up 99% of air.

_______ is/are fragments of dust, soil, salt, smoke, and ash upon which water vapor condenses to form clouds.

• ozone

• particulates

• CFCs

• all of the above

Answer explanation

The particulates may consist of dust, soil, salt, smoke, or ash. Some particulates pollute the air and may make it unhealthy to breathe.

Which gas exist in the highest concentration in the Earth's atmosphere?

• hydrogen

• oxygen

• ozone

• nitrogen

Answer explanation

Nitrogen is very stable in the atmosphere and is not involved to a great extent in chemical reactions that occur there.

Particulates nucleate water vapor to for clouds.

• True

• False

Answer explanation

Tiny particles are needed for water vapor to condense on. Without particles, water vapor could not condense. Then clouds could not form, and Earth would have no rain.

Tags

NGSS.MS-ESS2-4

NGSS.MS-ESS2-5

Green house gases in the atmosphere help plants to grow better.

• True

• False

Answer explanation

Greenhouse gases trap heat in the atmosphere! =)

Tags

NGSS.MS-LS1-5

Life-supporting gases such as oxygen, carbon dioxide, and nitrogen are chiefly concentrated in the exosphere.

• True

• False

Answer explanation

Because troposphere is the layer of atmosphere in which we live and it consists of 21% of oxygen, 78% of nitrogen and carbon dioxide is approximately 0.5% and other gases consits for only 0.5% like dust particles, water vapour, methane, etc.

Which of the following gases contribute to the greenhouse effect?

• carbon dioxide

• helium

• nitrogen

• none

Answer explanation

Human activities may increase the number of greenhouse gases, like carbon dioxide, in the atmosphere.

Tags

NGSS.MS-ESS3-5

Which gas is important for the process of photosynthesis?

• oxygen

• carbon dioxide

• nitrogen

• helium

Answer explanation

During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil.

Tags

NGSS.MS-LS1-6