Earth Systems

Ecosystems cannot be changed by humans.

• True
• False

Groundwater is stored in tiny holes in soil and rocks.

• True
• False

The core is the central part of the Earth.

• True
• False

By planting different crops during different years, farmers can use the land over and over.

• True
• False

About _____ of the world's water is salty ocean water. 

• 12%
• 43%
• 47%
• 97%

The ______ includes all of the gases around Earth

• hydrosphere
• crust
• atmosphere
• cloud

Which is an example of a process that can slowly change the surface of the Earth?

• earthquakes
• glaciers
• volcanoes
• landslides

Ecosystems can be changed by natural events or by human actions. Which is an example of a natural event?

• forest fire started by campers
• toxic smoke pouring out into the atmosphere
• building a road through a prairie ecosystem
• a volcano erupting

What is the name of the theory that explains how forces deep within the Earth can cause ocean floors to spread and continents to move?

• continental drift
• tectonic kinectics
• plate tectonics
• wave motions

Which of the following is NOT caused by the shifting of tectonic plates?

• earthquake
• landslide
• Tsunami
• volcanic eruption