Earth Science NC Check In

Which best describes the importance of an aquifer?

• It holds uncontaminated ground water for human consumption.

• It supplies all water for lakes and rivers.

• It provides water for oceans.

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How might fertilizer runoff from a soybean field affect the quality of water in the farm pond? 

• It increases the pH level.

• It decreases the overall water temperature. 

• It promotes algae growth, which lowers the oxygen level in the pond

• It decreases the turbidity, which lowers the amount of particles in the pond. 

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What would most likely happen to the entire ocean food web if plankton were not available?

• All organisms that live in the ocean would not survive.

• The organisms would adapt and find another source of food. 

• Only whales and other large ocean mammals would be affected.

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Why are upwellings in the ocean essential for some organisms to survive? 

• because many animals need low-tide conditions each day

• because currents carry predators away from the surface

• because the warm water kills bacteria before it can harm plankton

• because needed nutrients and dissolved gases are brought into new areas 

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The EPA (Environmental Protection Agency) regulates the level of turbidity in drinking water to protect public health. The EPA sets the limit at 0.3 NTU (Nephelometric Turbidity Units). The data below shows the turbidity level of four samples taken from the same location over four consecutive days. 
Based on the data, which best explains the quality of the drinking water?

• The drinking water is safe because the first two samples are belowthe recommended limit.

• The drinking water is unsafe because the last two samples are above the recommended limit.

• The drinking water is unsafe because the last two samples are below the recommended limit. 

• The drinking water is safe because the average of the samples is below the recommended limit. 

The water cycle describes the movement of the water of Earth. About 96% of the water of Earth is the salt water found in the oceans while the remaining 4% is fresh water. Where would the majority of the freshwater on Earth be found?

• groundwater and aquifers 

• swamps and wetlands

• ice caps and glaciers

• lakes and rivers

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Where is the majority of Earth’s freshwater found?

• polar ice caps

• rivers 

• ponds 

• lakes 

Which is most likely an example of point source pollution?

• fertilizer sprayed onto a field

• water runoff from a city street

• a pipe flowing into a river

An example of how living things can help clean up polluted water is

• driving more gas-powered vehicles

• allowing the rock in an aquifer to naturally purify groundwater

• avoiding using fertilizers on lawns or gardens.

• adding oil-eating bacteria to water polluted by an oil spill.

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Pesticides are most likely to be found in runoff from

• roads. 

• farm fields.

• homes. 

• factories. 

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