Hydrosphere

Which will result if there is increased upwelling in a coastal area?

• more aquatic life
• less nutrients in the water
• higher water temperatures
• fewer nitrates

Why is water from an aquifer more likely to be cleaner than water from other sources?

• because it forms where fresh and salt water meet
• it receives water directly from precipitation
• it rises to the surface near the ocean
• pollutants are filtered by rock and soil deep within earth

In which oceanic zone do clams and crabs survive by burrowing in the sand?

• oceanic
• intertidal
• deep ocean
• open ocean

Which best describes characteristics of a river basin?

• the land drained by a river and its tributaries
• the land formed when rivers create estuaries and marshes
• the land at the mouth of a river where water flows into the ocean
• the land formed as a result of a river flooding

Which technology is most efficient in mapping large areas of the ocean floor?

• sonar
• satellite imaging
• robots
• depth guage

Deep ocean technology has discovered organisms in hydrothermal vents that do not rely on sunlight to survive. What do these organisms use as their energy source?

• chemosynthesis
• electrical charge
• hydropower
• thermal heat

Which factors limit the productivity of a marine ecosystem?

• availability of light and nutrients
• availability of nutrients and fresh water
• availability of light and chemosynthetic organisms
  
• availability of photosynthetic organisms and fresh water

Which groundwater contaminant contained in fertilizers and pesticides comes from farms?

• bacteria
• mercury
• nitrates
• sodium

Which is the main source of dissolved oxygen in the ocean?

• underwater earthquakes
• decay of living organisms
• animals that live near the surface
• plants and algae that live near the surface

Which is the effect of too much nitrogen and phosphorus in a lake?

• algal blooms
• greater salinity
• decreased turbidity
• lower temperature