8th Grade Science Review

Front

What happens during an endothermic reaction?

Back

Heat is absorbed and chemical bonds are broken.

Front

Where does molten material rise from the mantle during sea-floor spreading?

Back

Along the mid-ocean ridge.

Front

Why do some plants have thorns?

Back

To stay safe from animals that want to eat the plant.

Front

What does the geologic time scale record?

Back

The life forms and geologic events in Earth’s history.

Front

What is the Rock Cycle?

Back

The process that forms and recycles different rocks.

Front

Define an endothermic reaction.

Back

A reaction that absorbs heat from its surroundings.

Front

What is sea-floor spreading?

Back

The process by which new oceanic crust is formed at mid-ocean ridges.

Front

What is the purpose of thorns on plants?

Back

To deter herbivores and protect the plant.

Front

What are sedimentary rock layers?

Back

Layers of rock formed by the accumulation of sediment.

Front

What is the significance of fossils in the geologic time scale?

Back

Fossils provide evidence of past life and help date rock layers.