LS 2-5 Review

Many houses are built on the sides of hills. Which of these actions would best prevent houses from sliding down hills after heavy rainfalls?

• increasing the slope of the hill

• spraying herbicides on the hill

• adding plants to the hill

• removing grass from the hill

Tags

NGSS.MS-LS2-4

Landscapers frequently plant grass on steep hills in the yards of new housing developments. Which statement best explains how grass can help conserve the soil?

• The grass provides shade so the soil stays cool.

• The grass attracts insects that enrich the soil by laying eggs.

• The roots of the grass spread out and hold the topsoil in place.

• The roots of the grass protect the soil from the effects of acid rain.

Desalination removes salt from water. Removing salt from water can be risky because the process is expensive and slow. Sometimes the technology does not work. A beach community’s surface water and underground fresh water were decreasing. The community decided to construct a large-scale plant to remove salt from the bay water. The plan to construct a salt-removing plant was accepted because the community

• needed increased resources.

• had access to advanced technology.

• had unlimited financial resources.

• needed to ease social pressures.

Tags

NGSS.MS-ESS3-4

NGSS.MS-ETS1-1

Vetiver grass is planted by farmers along the borders of corn fields. Which process does the vetiver grass most likely help farmers reduce?

• chemical weathering

• insect infestation

• freezing of crops

• water erosion

The table below identifies three steps in one part of the process of purifying drinking water. Which correctly identifies the order of the steps when they are used in water treatment?

• coagulation, flocculation, precipitation

• precipitation, coagulation, flocculation

• flocculation, coagulation, precipitation

• precipitation, flocculation, coagulation

Tags

NGSS.MS-PS1-2

In 2014, a break in a storm water pipe released thousands of gallons of coal ash from a retired electrical plant into a river. The spill occurred upstream from the water treatment plants that serve communities along the river. Coal ash contains several hazardous metals including arsenic. Which stage of the water treatment process is most likely to remove hazardous metals from the water?

• aeration

• coagulation

• disinfection

• reverse osmosis

Tags

NGSS.MS-PS1-2

A small community is building their first water treatment plant, but has limited amounts of land and money available. One of the council members suggests reducing costs and land needs by leaving out the aeration pond. The plant supervisor explains that aeration is a necessary step in treating drinking water. What is the most important reason the town should include an aeration pond in their water treatment plant?

• Aeration kills anaerobic bacteria.

• Aeration removes dissolved gases.

• Aeration oxidizes dissolved metal ions.

• Aeration removes some solvents and chemicals.

Tags

NGSS.HS-PS1-5

The left side of the river has been reinforced by a rock wall to prevent erosion. Which would best help in preventing the right side of the river from being eroded?

• loose soil

• thick grass

• heavy rainfall

• increased grazing by animals

Tags

NGSS.MS-ESS2-1

NGSS.MS-ESS2-2

A farmer has a steeply sloping pasture that is eroding. Which is the best option to stop the immediate erosion of the topsoil?

• Increase the amount of vegetation on the sloping pasture.

• Plant trees and shrubs at the bottom of the sloping pasture.

• Increase the soil thickness by adding five inches of sandy soil.

• Increase the organic content of the topsoil by adding earthworms.

Tags

NGSS.MS-ETS1-3

Florida has an abundance of mangrove wetlands. The roots of a black mangrove tree are characterized by pencil-like roots that project upward through the soil and water. Which is the most likely way the root system of black mangroves affects the coastal landscape?

• The root system forms more sand dunes.

• The root system decreases erosion of shoreline.

• The root system decreases coastal water levels.

• The root system supplies other plants with needed water.

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4