NC Science

Which best explains why inhabitants of an estuary must adapt to frequent environmental changes?

• Estuaries receive little sunlight.

• The water temperature is constantly warm.

• The salinity of the water is constantly changing.

• Low levels of oxygen are absorbed by the water.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-4

Which would most likely cause a sudden increase of nitrates in a waterway?

• spill from an oil tanker

• runoff from a boat yard

• runoff from a golf course

Mary pours 1,000 mL of water into a beaker to represent all of the water on Earth. She then measures out 800 mL and puts it into another beaker. Which portion of Earth’s water is most closely represented by the 800 mL?

• water in the ocean

• water in the ground

• water in lakes and rivers

• water trapped in polar ice caps

Indicators of aquatic health are best observed under which conditions?

• once every ten years

• at the surface, every year

• once a year at many depths

• many times a year at many depths

Which best explains why there is a greater concentration of oxygen located near the ocean’s surface?

• Sunlight warms the ocean’s temperature and stimulates oxygen production near the surface

• Plankton produces excess amounts of nutrients that remove oxygen levels from the atmosphere

• Marine life gives off oxygen instead of carbon dioxide, which makes the ocean water rich in oxygen

• Plants, which release oxygen, live near the surface of the ocean, where they receive large amounts of sunlight

Which are the most abundant dissolved gases in ocean water?

• nitrogen and carbon dioxide

• oxygen and carbon dioxide

• oxygen and methane

• nitrogen and sulfide

Which would most likely result in an unhealthy aquatic habitat?

• a decrease in turbidity

• a decrease in nitrates levels

• an increase in water temperature

• an increase in dissolved oxygen levels

Tags

NGSS.MS-LS2-4

Which would most negatively impact local water availability?

• floods

• droughts

• hurricanes

Tags

NGSS.MS-ESS2-4

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

Tags

NGSS.MS-ESS3-1

Which percentage represents the amount of freshwater on Earth?

• 3%

• 23%

• 71%

Tags

NGSS.MS-ESS2-4