question: Write a question you would see in a school textbook. OPTIONS:
- the shapes of plates
- the relative sizes of plates
- the relative densities of plates
- the arrangement of plates relative to one another
answer: A student uses clay to build models of an ocean plate and a continental plate. What characteristic cannot be accurately represented by the models?

question: Write a question you would see in a school textbook. OPTIONS:
- They add oxygen to the soil.
- They release oxygen into the air.
- They fix carbon dioxide in the soil.
- They store carbon dioxide in roots.
answer: How are green plants an important part of the carbon dioxide-oxygen cycle?

question: Write a question you would see in a school textbook. OPTIONS:
- melting and hardening
- cooling and heating
- deposition and cementing
- uplifting and faulting
answer:
Which of these processes can cause layers of rock to be arranged so that the youngest layers are found below older layers?