8th Science STAAR Review

Front

What evidence indicates a chemical reaction occurs when baking a cake?

Back

The cake rises as gas bubbles form in the baking cake.

Front

What does biodiversity refer to?

Back

The variety of species on Earth.

Front

What type of plate boundary created the Great Rift Valley and the Mid-Atlantic Ridge?

Back

Divergent.

Front

How is average speed calculated?

Back

Total distance divided by total time.

Front

Why does a large rock remain motionless on a flat sidewalk?

Back

The forces acting on the rock are all balanced.

Front

What is the definition of a chemical reaction?

Back

A process that leads to the transformation of one set of chemical substances to another.

Front

What is an example of a physical change?

Back

Melting ice.

Front

What is the law of conservation of mass?

Back

Mass is neither created nor destroyed in a chemical reaction.

Front

What is an ecosystem?

Back

A community of living organisms and their physical environment interacting as a system.

Front

What is the difference between renewable and nonrenewable resources?

Back

Renewable resources can be replenished naturally, while nonrenewable resources cannot.