Grade 7 Science Quiz: Earth's Atmosphere

What are the four main layers of Earth's atmosphere?

• Troposphere, Stratosphere, Mesosphere, Thermosphere

• Lithosphere, Hydrosphere, Biosphere, Atmosphere

• Cloudosphere, Ozoneosphere, Ionosphere, Exosphere

• Stratosphere, Troposphere, Exosphere, Hydrosphere

What is the composition of the troposphere?

• Methane, ammonia, sulfur dioxide, nitrogen dioxide, ozone

• Hydrogen, helium, nitrogen, oxygen, neon

• Helium, neon, krypton, xenon, radon

• Nitrogen, oxygen, argon, carbon dioxide, water vapor

What is the ozone layer and why is it important?

• A layer of the Earth's stratosphere that contains a high concentration of ozone molecules; it is important because it helps to protect life on Earth by absorbing the majority of the sun's harmful ultraviolet radiation.

• A layer of the Earth's mantle that contains a high concentration of nitrogen molecules; it is important because it helps to create rain.

• A layer of the Earth's crust that contains a high concentration of oxygen molecules; it is important because it helps to cool down the planet.

• A layer of the Earth's core that contains a high concentration of carbon dioxide molecules; it is important because it helps to regulate the planet's temperature.

How does the stratosphere differ from the troposphere?

• The stratosphere is closer to the Earth's surface than the troposphere.

• The stratosphere contains the ozone layer.

• The stratosphere is composed mainly of nitrogen and oxygen, while the troposphere contains more carbon dioxide.

• The stratosphere is where weather events occur, while the troposphere is more stable.

What are the primary gases found in the mesosphere?

• oxygen and nitrogen

• hydrogen and methane

• argon and krypton

• carbon dioxide and helium

What is the thermosphere and what role does it play in Earth's atmosphere?

• The thermosphere is where most weather phenomena occur and it regulates the Earth's climate.

• The thermosphere is the layer of the atmosphere closest to the Earth's surface and is responsible for protecting the planet from harmful solar radiation.

• The thermosphere is a layer of the atmosphere that contains most of the Earth's oxygen and is essential for human survival.

• The thermosphere absorbs the sun's ultraviolet radiation and is where the International Space Station orbits.

Explain the greenhouse effect and its impact on Earth's atmosphere.

• The greenhouse effect is caused by the depletion of the ozone layer.

• The greenhouse effect has no impact on Earth's atmosphere.

• The greenhouse effect cools Earth's atmosphere by reflecting heat from the sun.

• The greenhouse effect warms Earth's atmosphere by trapping heat from the sun.

What are the different types of clouds found in the atmosphere?

• Fish, Birds, Insects

• Sun, Moon, Stars

• Rocks, Trees, Rivers

• Cumulus, Stratus, Cirrus, and Nimbus

How does air pressure change with altitude in the atmosphere?

• Air pressure remains constant

• Air pressure increases

• Air pressure decreases

• Air pressure fluctuates

What causes the phenomenon of auroras in the atmosphere?

• Solar wind particles interacting with the Earth's magnetic field and atmosphere

• Global warming causing changes in the atmosphere

• Alien spacecrafts emitting light into the sky

• Volcanic eruptions releasing gases into the atmosphere