7th grade Science Review #1

Front

Which layer of the atmosphere contains the most water vapor?

Back

The troposphere contains the most water vapor.

Front

What happens to a rope when two students pull on it in opposite directions with unequal forces?

Back

The rope will accelerate in the direction of the greater force.

Front

Why is ozone depletion in the upper atmosphere a concern for scientists?

Back

Ozone depletion allows ultraviolet radiation to reach Earth’s surface, which can harm living organisms.

Front

How do air molecules in the troposphere compare to those in the thermosphere?

Back

Air molecules are closer together in the troposphere and farther apart in the thermosphere.

Front

What happens to the mechanical energy of a falling rock?

Back

The mechanical energy remains the same as potential energy is converted into kinetic energy.

Front

Define the troposphere.

Back

The troposphere is the lowest layer of Earth's atmosphere, where weather occurs and most water vapor is found.

Front

What is kinetic energy?

Back

Kinetic energy is the energy of an object in motion.

Front

What is potential energy?

Back

Potential energy is the stored energy of an object due to its position or state.

Front

Explain the concept of force in physics.

Back

Force is a push or pull on an object that can cause it to accelerate.

Front

What is the significance of ultraviolet radiation?

Back

Ultraviolet radiation can cause skin damage and increase the risk of skin cancer.