What is one way scientists analyze the health of a river?

by measuring the distance the river travels to reach an ocean

by measuring the speed at which the river flows

by measuring its dissolved oxygen

Which example BEST represents an interconnection between an aquatic food web and a terrestrial food web?

Fish eat insects that land on the surface of a pond.

Mountain lions catch and eat deer.

What is one way the government of the United States attempts to reduce pollution in the oceans?

enforce laws limiting trash dumping

discontinue sewage treatment programs

increase oil and gasoline production

The population density of marine life is denser along the shorelines of the ocean than farther out in the deep waters of the ocean. Which statement provides the BEST reason for this situation?

There are more nutrients in shallow waters.

Ocean currents prevent many smaller marine organisms from living in deep water.

The shallow waters have fewer predators.

Coastal waters are less polluted than the deeper waters of the ocean.

A scientist has a hypothesis that a large volcanic eruption caused a change in global temperature. Which information gained from ice cores is MOST useful in supporting the scientist's hypothesis?

estimates of natural radioactivity

Which project is MOST LIKELY to interest a scientist working at a biotechnology company?

development of genetically modified corn plants

study and reconstruction of fossilized bones

conservation of key species within ecosystems

prevention of sewage leaking into water supplies

Which BEST explains the importance of dissolved gases in the ocean?

They help provide oxygen for aquatic animals.

They help maintain a constant water temperature.

They help maintain constant levels of salinity.

Which BEST describes a bio-indicator?

a species that depends on specific conditions to survive

a species that has a short life span

a species that can adapt to a variety of conditions

a species that has been introduced to an ecosystem

After a chemical reaction occurs in an open test tube, measurements indicate that the mass of the reactants is greater than the mass of the products remaining in the test tube. What MOST LIKELY explains the measurements?

The salinity of the reactants was high.

The temperature of the reactants was low.

A layer of marine fossils is discovered in a desert environment. Which hypothesis BEST explains the discovery?

The area was once covered by water.

Volcanic activity once occurred in the area.

A catastrophic event once occurred in the area.

Erosion turned most of the limestone in the area into sand.

Which theory BEST describes how an asteroid striking Earth may have caused the extinction of dinosaurs?

Dense clouds formed following the collision, causing a global drop in temperature.

Heat from the asteroid caused massive fires that reduced the food supply.

Land masses were altered by the collision, reducing the space where dinosaurs could roam for food.

Glaciers melted rapidly from heat produced by the asteroid, causing floods that destroyed dinosaurs' habitats.

Which statements BEST explains the reason muscle cells have more mitochondria than skin cells?

Muscle cells use more energy than skin cells.

Muscle cells have fewer proteins than skin cells.

Muscle cells have a smaller nucleus than skin cells.

Muscle cells have more excess water than skin cells.

How are parasites and viruses similar?

Both reproduce using host cells.

Both break down food using oxygen.

Which describes a nonpoint source of pollution?

runoff from a road into a nearby stream

accumulation of oil in a stream next to a gas station

chemical spill in a river next to a manufacturing complex

liquid fertilizer flowing from a barrel into a stream

Which statement BEST explains the reason some insects can walk across the surface of a lake?

Water is a polar molecule, and its adhesiveness causes high surface tension.

Water is a polar molecule, and its adhesiveness causes good capillary action.

Water is a non-polar molecule, and its cohesiveness causes good capillary action.

Water is a non-polar molecule, and its adhesiveness provides high surface tension.

Which of these BEST illustrates natural selection?

An organism with favorable genetic variation will tend to survive and breed successfully.

A population monopolizes all of the resources in its habitat, forcing other species to migrate.

A community whose members work together utilizes all existing resources and migratory routes.

The largest organisms in a species receive the only breeding opportunities.

Earth has undergone some catastrophic changes from time to time. Which of these MOST LIKELY explains why life on Earth continued following these catastrophes?

A wide diversity of species existed.

Dominant species had a slow mutation rate.

Many species filled the same niche.

A strong species had many different characteristics.

A single species of squirrel evolved over time into two species, each on opposite sides of the Grand Canyon. This change was MOST LIKELY due to:

the isolation of the two groups

higher mutation rates on one side

low genetic diversity in the initial population

differences in reproduction rates

Atoms of the same element must -

contain the same number of protons

contain the same number of neutrons

have equal numbers of protons and neutrons

An increase in atomic number is related to an increase in atomic mass because -

more protons are present in the atomic nucleus

more electrons are present in the atomic nucleus

more electrons are orbiting the atomic nucleus

more protons are orbiting the atomic nucleus

A chemical change always -

forms one or more new substances

Scientists can use fossils in rocks to -

match up rock layers at different places

When you have a cold, which of the following helps to prevent other people from catching it?

helping cook dinner for your family

giving high-fives to your friends

playing a card game with your relativees

What would MOST LIKELY happen if too many nitrates entered an estuary?

Algae blooms would block the sun causing fish to suffocate from not enough oxygen.

Nutrients would be used up by the fish and plants keeping the estuary in balance.

Nutrients would sink to the bottom creating soil deposition

Algae blooms would grow and provide more food for the fish.

If the temperature of a lake gets too far above the preferred range, which BEST describes what will happen to the species in the lake over time?

The high temperatures will cause a gradual decrease in the number of existing species.

The reproduction rate will decrease, allowing existing species to thrive.

The reproduction rate will increase, resulting in larger species populations.

The high temperatures will cause a sharp increase in the amount of algae and existing species will thrive.

8th grade Science NC EOG Review

Quiz

•

Chemistry, Biology, Other Sciences

•

KG - University

•

Practice Problem

•

Medium

•

NGSS

HS-PS1-1, HS-LS4-5, MS-PS1-2

+37

Standards-aligned

Used 2K+ times

FREE Resource

About this resource

This quiz covers comprehensive 8th grade physical science, life science, and earth science topics aligned with end-of-grade testing standards. The questions assess students' understanding of atomic structure and the periodic table, chemical versus physical changes, conservation of matter, classification of elements and compounds, and basic properties of matter. Students need strong foundational knowledge in cell biology, particularly cellular respiration and mitochondrial function, along with evolution concepts including natural selection, fossil evidence, and species adaptation. The earth science component requires understanding of water systems, ocean characteristics, pollution sources, renewable energy, and geological processes. Students must demonstrate scientific reasoning skills to analyze experimental scenarios, interpret data, and apply scientific laws to novel situations. This quiz was created by a classroom teacher who designed it for students studying 8th grade science. The comprehensive nature of this assessment makes it ideal for end-of-year review, covering the breadth of concepts students encounter throughout their 8th grade science curriculum. Teachers can use this quiz effectively as a diagnostic tool early in the review process to identify knowledge gaps, or as a formative assessment to gauge student readiness for standardized testing. The variety of question types and difficulty levels support differentiated instruction, allowing teachers to address specific misconceptions through targeted reteaching. This resource aligns with NGSS standards 5-PS1-1, 5-PS1-3, MS-PS1-1, MS-PS1-5, MS-LS1-5, MS-LS4-1, MS-ESS1-4, and MS-ESS3-3, making it valuable for both classroom practice and homework assignments that reinforce key scientific concepts and vocabulary.

80 questions

Show all answers

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A student is asked to categorize the following items as elements, compounds, or mixtures: copper wire, salt, aluminum foil, baking soda, a piece of granite, and sugar water. He lists ELEMENTS as copper wire, aluminum foil, and baking soda; COMPOUNDS as salt; MIXTURES as the piece of granite and sugar water. Which is in the wrong category?

copper wire

sugar water

baking soda

salt

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Why is water classified as a compound?

Because it is an element, which consists of only one type of atom.

Because it is a substance, which can easily be separated.

Because it is a substance composed of two or more kinds of atoms bonded together.

Because it is an unevenly mixed solution, or a heterogeneous mixture.

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A student is designing an experiment for the science fair. She needs to find a material that conducts an electric current, and her teacher has provided her with samples of the following elements. Which of them should she choose?

argon

copper

fluorine

phosphorous

Tags

NGSS.HS-PS1-1

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The mass of the products in a chemical reaction is the same as the mass of the reactants in the reaction. Which law best describes this statement?

The Law of Conservation of Angular Momentum

The Law of Superposition

The Law of Conservation of Matter

The Law of Entropy

Tags

NGSS.HS-PS1-7

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which is an example of a chemical reaction?

a pot of water boiling

an iron nail rusting

a piece of ice melting

a sugar cube dissolving in tea

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A scientist recognizes a white powder as sugar due to its white crystals and its sweet taste. However, the scientist notices that the elements that make up the sugar - carbon, hydrogen, and oxygen - look nothing like sugar, nor are they sweet. What is the best explanation for this?

Sugar is a compound, and compounds usually have a different appear

Sugar is an element, so its properties are unique.

Sugar is a heterogeneous mixture, so its appearance is unique.

Substances in nature change randomly and it is impossible to predict those changes.

Tags

NGSS.HS-PS1-1

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which statement supports the theory of evolution?

All living cells come from previous cells.

All plants and animals have DNA.

Matter cannot be created or destroyed during chemical reactions.

Fossils provide evidence that vertebrates share a common ancestor.

Tags

NGSS.HS-LS4-1

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