Pre-Test: Earth's Water

Front

What is a point source of ocean pollutant?

Back

A point source of ocean pollutant is a single, identifiable source of pollution, such as a nearby volcanic eruption.

Front

Why are Earth's oceans salty?

Back

Earth's oceans are salty because rain washed salts into them.

Front

Why does an ice cube float in water?

Back

An ice cube floats in water because ice is less dense than water.

Front

What is a watershed?

Back

A watershed is an area of land that drains runoff into a stream or other body of water.

Front

What does D=M/V represent?

Back

D=M/V represents the formula for density, where D is density, M is mass, and V is volume.

Front

What is density?

Back

Density is the mass per unit volume of a substance.

Front

What happens to the density of water when it freezes?

Back

When water freezes, its density decreases, causing ice to float.

Front

What is runoff?

Back

Runoff is water that flows over the ground surface and into bodies of water.

Front

What is the main cause of ocean salinity?

Back

The main cause of ocean salinity is the weathering of rocks and minerals, which releases salts into the water.

Front

What is the difference between point source and non-point source pollution?

Back

Point source pollution comes from a single, identifiable source, while non-point source pollution comes from multiple, diffuse sources.