AP Environmental Science : Salt Water

Study concepts, example questions & explanations for AP Environmental Science

varsity tutors app store varsity tutors android store

Example Questions

Example Question #1 : Salt Water

Desalinization plants are becoming popular in the Middle East and heavily proposed in drought states like California to satisfy the public's use of fresh water. What is the dominant issue with establishing desalinization facilities?

Possible Answers:

Most of our planet's oceans are heavily polluted and desalinating sea water will remove the salt, but harmful pollutants and toxins that affect human health can remain present. 

Building desalinization facilities offshore is legally difficult due to international regulations on ocean management. 

The National Environmental Policy Act (NEPA) requires environmental impact statements be conducted for any federally-funded project, and involves too much red tape for a desalinization plant to be economically feasible. 

Desalinization removes most of the salt content, but not all of it, posing a serious risk of dehydration or heart problems when consumed by humans. 

Desalinization requires a lot of heat energy to create freshwater vapor, and is generally a very expensive process. 

Correct answer:

Desalinization requires a lot of heat energy to create freshwater vapor, and is generally a very expensive process. 

Explanation:

Desalinization involves heating seawater to a boil, resulting in pure, distilled water vapor with no impurities. While any ferally-funded project is subject to environmental assesments, the major roadblock for these facilities is the heat energy required to distill the seawater. 

Example Question #41 : Introductory Concepts And Earth Science

In sea water, carbon is mostly found in the form of __________.

Possible Answers:

phosphoric acid

bicarbonate ions

methane gas

carbon monoxide

glucose

Correct answer:

bicarbonate ions

Explanation:

When atmospheric carbon dioxide reacts with ocean water, they combine to product the bicarbonate iron, or . This ion acts as a buffer in the sea water, allowing the pH to remain relatively stable. While neither methane, glucose, nor carbon monoxide occur in large enough quantities in salt water, phosphoric acid actually contains no carbon.

Example Question #42 : Introductory Concepts And Earth Science

Aquifers provide water for millions of people. But when aquifers are used at faster rate than they can replenished a deficit occurs which causes a number of problems. 

What is it called when aquifers in coastal areas start to fill with ocean water?

Possible Answers:

Saltwater instusion

Depletion

Artesian

Groundwater

Confined

Correct answer:

Saltwater instusion

Explanation:

Aquifers are part of groundwater. Saltwater intrusion occurs because of aquifer depletion. The empty space can then be filled with sea water. Confined and artesian are types of aquifers. 

Learning Tools by Varsity Tutors

Incompatible Browser

Please upgrade or download one of the following browsers to use Instant Tutoring: