An island that forms when a coral colony reproduces and the reef grows larger and upward.

An island that forms when lava builds up from a volcano on the ocean floor.

An island that forms when a chunk of land breaks off from a continent.

The dropping of weathered material in one place is…

The loosening and carrying away of weathered material from one place to another is…

A natural structure on Earth's surface is...

The breaking down of rock by interactions with Earth’s systems is...

What type of island protects the coast from ocean waves and wind during storms?

The _____________________ was formed when the Colorado River wore away rock.

Earth's systems are ___________________ interacting.

Which of the following is a barrier islands?

Which of the following are coral islands?

Which of the following are continental islands?

Which of the following is a volcanic island?

Industries release harmful chemicals into the air, which reacts with sunlight to form...

The large quantities of methane gas produced by the millions of cows raised on farms can contribute to...

Most farmers add _____________________ to the soil to kill weeds and harmful insects.

Fertilizer also provides crops with _____________________.

Fertilizers are toxic materials that cause _______________ when rain washes the fertilizer from soil.

Pollution causes low levels of _____________________ in rivers and lakes.

When there is no oxygen in a body of water it becomes _____________________ because nothing can live there.

Running water can wash away topsoil when crops are planted on sloping land. Farmers plow the soil in curved bands that follow the shape of the land. This prevents _____________________.