Ecosystems
States of Matter
Space Systems
Earth's Water
Earth's Spheres
100

These organisms make their own food using sunlight

What are producers

100

This state of matter has a fixed shape and fixed volume

What is a solid?

100

The star at the center of our solar system

What is the Sun?

100

About 97% of Earth’s water is found here

What are the oceans?

100

This sphere includes all the land on Earth.

What is the geosphere?

200

This term describes all the living and non-living things in one place interacting together.

What is an ecosystem?

200

This state of matter takes the shape of its container but has a fixed volume.

What is a liquid?

200

This unit of distance—about 9.46 trillion kilometers—measures how far light travels in one year.

What is a light-year?

200

The continual movement of water through the atmosphere and back to Earth.

What is the water cycle?

200

“All the water on earth, including lakes, oceans, and glaciers.

What is the hydrosphere?

300

A relationship where one organism eats another for energy.

What is a food chain?

300

The process of a liquid becoming a gas.

What is evaporation?

300

This factor most directly affects how bright a star appears from Earth.

What is distance?

300

Water stored underground in layers of rock and soil

What is groundwater?

300

The sphere of air around Earth.

What is the atmosphere?

400

These organisms break down dead material and recycle nutrients back into the soil.

Who are decomposers?

400

The change when a gas becomes a liquid.

What is condensation?

400

This Earth motion causes stars to seem to move across the sky from east to west each night.

What is Earth’s rotation?

400

This type of water has low salt content and is found in rivers, lakes, and wetlands

What is freshwater?

400

All living things on Earth make up this sphere.

What is the biosphere?

500

A diagram that shows many food chains and how they overlap in an ecosystem

What is a food web?

500
Particles going from a solid to into a gas state skipping over the liquid phase

What is sublime?

500

This characteristic of Earth—its tilt—causes the seasons and changes in daylight length during the year.

What is the Earth’s axis?

500

This process returns water vapor to tiny droplets in the air, forming clouds

What is condensation?

500

This layer of the geosphere is liquid and surrounds Earth’s inner core.

What is the outer core?