Earth's water is sorted into stores: ocean, ice caps and glaciers, groundwater, lakes and rivers, and atmosphere. Which store holds the greatest share of all water?

Fresh water stores include ice caps and glaciers, groundwater, lakes and rivers, and the atmosphere. Which store holds the most fresh water?

Snow piles up high in the mountains year after year and packs into thick ice that slowly moves downhill. Which store is this water part of?

After rain, some water soaks down through the soil and fills tiny spaces between grains of sand and rock. What store is this water part of?

Water can be held as vapor in air and tiny droplets in clouds. What Earth water store is being described?

What percent of Earth's water is found in ice caps and glaciers?

About 97 percent of Earth's water is salt water. About what share is fresh water?

Salinity means how much dissolved salt water holds. Ocean water has high salinity, while most river water has low salinity. What kind of water is most of Earth's water?

A glacier contains fresh water, but a nearby city cannot drink it directly. Why is most frozen fresh water hard for people to use?

Earth has a huge amount of water, but only a small part is fresh and easy to reach. What explanation fits this fact?

Ocean water is not usually used directly for drinking because its salinity is high. What does high salinity mean?

A water molecule can stay in some of Earth's water stores much longer than in others. In which of these can it usually stay the longest?

A town near the coast has ocean water nearby but still protects its fresh water reservoir. Why is ocean water not counted as ready-to-use fresh water?

Earth looks blue from space because ocean water covers much of its surface. About how much of Earth's surface does the ocean cover?

What happens to pressure when traveling from the sunlight zone to the trench zone?

What happens to temperature when traveling deeper into the ocean?

Underwater mountains that do not break the ocean surface

The vast, flat part of the ocean.

What letter identifies underwater mountain chains as a result of sea-floor spreading?

Underwater canyons that are some of the deepest spots on Earth.

The largest and deepest ocean that separates North America from Asia.

The ocean that separates North America from Europe.

The ocean found near the North Pole is covered with ice.

Abyssopelagic is also known as

Hadalpelagic is also known as

In what zone does sunlight completely disappear?

Bathypelagic is also known as

Mesopelagic is also known as

Epiplagic is also known as

The only layer of the ocean where photosynthesis can occur