Which of the following includes all of the water on or near Earth’s surface?

• geosphere
• hydrosphere
• atmosphere
• lithosphere

Where is most of the fresh water on Earth located?

• in reservoirs and lakes
• in ice caps and glaciers
• in oceans
• in streams and tributaries

Ocean water _____ than fresh water.

• freezes at a higher temperature
• contains more salts
• supports fewer fish
• is less abundant

Deep currents flow along the

• ocean floor.
• ocean surface.
• thermocline.
• halocline.

Surface currents circulate in different directions, depending on the _____ in which they occur.

• hemisphere
• troposphere
• hydrosphere
• biosphere

The layer of the ocean extending from the base of the thermocline to the bottom of the ocean

• surface layer
• thermocline
• deep zone
• bottom zone

The layer of the ocean in which temperature decreases more rapidly with depth than the others.

• surface layer
• thermocline
• deep zone
• bottom zone

With respect to energy, Earth is a(n)

• unstable system
• stationary system
• open system
• closed system

What part of Earth encompasses all areas where organisms can obtain the energy they need?

• biosphere
• hydrosphere
• atmosphere
• lithosphere

Currents at the surface of the ocean are driven by

• tectonic plates.
• gravity.
• salinity.
• wind.