Which most likely has the highest number of contaminants in the water?

a water system with high turbidity

a water system with moderate turbidity

a water system with low turbidity

a water system with no turbidity

How does the use of a pH meter help monitor the hydrosphere?

by indicating whether the water is too acidic or basic

by indicating if there is too much sediment in the water

by indicating whether microorganisms are living in the water

by indicating if there is enough dissolved oxygen in the water

Which is the most important reason for maintaining clean water?

Organisms cannot live and grow without water.

Energy cannot be generated without water.

Goods cannot be transported easily without water.

People cannot maintain proper hygiene without water.

Which will most likely happen to a biological indicator species if there is a sudden increase in pollution?

There will be a significant decrease in the population numbers and the quality of the individuals.

There will be a significant increase in the population numbers and the quality of the individuals.

The biological indicator species will reproduce at lower rates, which will maintain population numbers.

The biological indicator species will reproduce at higher rates, which will maintain population numbers.

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.

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

because needed nutrients and dissolved gases are brought into the photic zone.

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

Water molecules are polar, with the:

oxygen side being slightly negative and the hydrogen side being slightly positive.

oxygen side being slightly positive and the hydrogen side being slightly negative.

oxygen and hydrogen sides being slightly negative.

oxygen and hydrogen sides being slightly positive

Estuaries are important because they:

provide shelter for young organisms

filter out pollution from the ocean

Primary law that ensures safe drinking water in the U.S; regulates lead, nitrates, and mercury

the Federal Water Pollution Control Act

U.S. Marine anti-pollution Control Act

Which describes the hydrosphere?

all of the water in Earth’s oceans, lakes, seas, rivers, and glaciers, plus the water in the atmosphere

all of Earth’s organisms and the environments in which they live

a layer of Earth’s atmosphere made up primarily of concentrated ozone

Large bodies of water do not quickly fluctuate in temperature. Why?

Water has a high heat capacity because of it's specific heat

Which of the following best describes why estuaries are important resources?

They are among the most productive types of ecosystems.

They are the world's richest sources of precious metals.

They help stabilize the global climate.

They prevent weathering of rock from slopes and cliffs.

A researcher studies water samples from two different rivers. The researcher finds that the pH in river 1 is 7.01 and the pH in river 2 is 6.98. The water from both rivers is transparent, but the water in river 1 is much warmer than river 2. Based on the researcher's findings, which river has higher quality water and why?

River 2; it has higher dissolved oxygen levels due to its lower temperature.

River 2; it has a neutral pH value.

River 1; the water is clear and free of suspended solids.

River 1; the water can dissolve more solids due to its higher temperature.

A researcher selects two water samples (A and B) to study potability and safety. The researcher records the pH of water sample A as 4 and water sample B as 7. Both water samples also contain low levels of materials such as iron and aluminum. Which statement correctly expresses the safety of the water samples?

Water sample B is safer than water sample A because the materials are less toxic at a neutral pH.

Water sample A is safer than water sample B because the materials evaporate at an acidic pH.

Water sample A is safer than water sample B because the materials are less toxic at an acidic pH.

Water sample B is safer than water sample A because the materials can easily dissolve in water with a basic pH.

A researcher analyzes the water in a stream and observes that the water contains many snails, crayfish, shrimp, caddisflies, mayflies and stoneflies. These organisms are invertebrates that are used as bioindicators for bodies of water. What can be concluded correctly about the water in the stream?

The presence of a variety of invertebrates indicates that the water is suitable for aquatic life.

The presence of any living organisms indicates the water is safe to drink.

The presence of many different types of invertebrates indicates the water is polluted.

The presence of insects indicates that decomposition is taking place in the water.

something that makes water no longer suitable for use

a single identifiable source of pollution

Alonzo and Jason are hiking on a nature trail. The boys become very thirsty, but they forgot to bring any drinking water with them. Jason notices some very clear water in a spring, so he cups his hands to fill them with the water. As Jason fills his hands, he notices the water is cool. Jason prepares to take a drink, but Alonzo stops him.Which statement best explains why Alonzo stops Jason from drinking the water?

Clear water may contain odorless, tasteless, and colorless harmful contaminants.

The water needs to be colder in order to ensure there are no contaminants in it.

The water needs to be warmer in order to ensure there are no contaminants in it.

Clear water is always safe to drink, but Jason’s hands are covered with harmful contaminants.

What is the main purpose for adding chlorine during the water treatment process?

It kills disease-causing bacteria and microorganisms.

It improves the taste and odor of treated water.

It keeps the pH of treated water within an acceptable range.

It removes traces of harmful metals such as lead.

How does Ekman transport work?

Wind blows parallel to water edge. Friction forces and coriolis forces produce a net force perpendicular to the wind direction.

Wind blows away from water edge. Friction forces produce a movement of water away from the shore allowing colder water to come in.

Wind blows parallel to water edge. Friction forces cause a net force in direction of wind. Water moves in wind direction allowing cold water to replace it.

Wind blows towards water edge. Friction forces and coriolis forces make water move parallel to water edge.

Hmh Science Module E

Authored by Charles Martinez

Science

8th Grade

NGSS covered

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50 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

Why do large numbers of ocean life-forms live near areas of upwelling?

Upwelling brings nutrients to the surface.

Upwelling brings warm water to the surface

Upwelling helps push small fish up toward the surface

D. Upwelling keeps large predator fish away from the surface

Which of the following could occur as the result of runoff of high nitrogen fertilizers from farmlands near a lake?

an increase in algae growth resulting in low oxygen levels in the lake

a decrease in mineral storage reducing carbon levels of the lake

a decrease in pollution resulting in lower ozone levels in the lake area

an increase in deforestation reducing animal populations in the lake area

Which is the main source of dissolved oxygen in a body of water?

erosion

the atmosphere

volcanic eruptions

plants

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

point source spill from an oil tanker

non point source runoff from a boat yard

non point source runoff from a golf course

point source discharge from a chemical plant

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which is an unlikely source of water for a river basin?

melting snow

ocean water

melting ice

rain

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Of the 74% of Earth’s surface that is covered in water, which contains the most water?

lakes

rivers

oceans

streams

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Hmh Science Module E

Which would most likely result in an unhealthy aquatic habitat?

Why do large numbers of ocean life-forms live near areas of upwelling?

Which of the following could occur as the result of runoff of high nitrogen fertilizers from farmlands near a lake?

Which is the main source of dissolved oxygen in a body of water?

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

Which is an unlikely source of water for a river basin?

Of the 74% of Earth’s surface that is covered in water, which contains the most water?

Which is Earth’s largest source of drinkable water?

Which most likely has the highest number of contaminants in the water?

How does the use of a pH meter help monitor the hydrosphere?

Access all questions and much more by creating a free account

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