4G Science 2nd 9wks Review

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and dissolving.

Front

What happens during the melting of ice?

Back

During the melting of ice, solid ice absorbs heat and changes into liquid water. This is a physical change.

Front

What is the relationship between mass and falling time of objects?

Back

Falling time does not change with the mass of a falling object; all objects fall at the same rate in a vacuum.

Front

What is renewable resource?

Back

A renewable resource is a natural resource that can be replenished naturally over time, such as plants, animals, and water.

Front

What can cause some animals to become extinct?

Back

Some animals may become extinct or endangered due to overfishing, habitat loss, and environmental changes.

Front

What is the disadvantage of building dams on rivers?

Back

Building dams can damage the river environment, affecting the ecosystem and the species that depend on it.

Front

What is evaporation?

Back

Evaporation is the process by which liquid water turns into water vapor, usually due to heat.

Front

What is condensation?

Back

Condensation is the process by which water vapor cools and changes back into liquid water, forming droplets.

Front

What is the role of gravity in falling objects?

Back

Gravity is the force that pulls objects toward the Earth, causing them to fall.

Front

What is an example of a nonrenewable resource?

Back

A nonrenewable resource is a resource that cannot be replenished in a short period of time, such as fossil fuels.