Grade 8 Science (12)

Grace, Mia, and Ava are working on a school project about flood prediction techniques. They have listed two techniques: using a rain gauge and using a satellite.

Which statement correctly identifies the more effective technology for predicting floods in their project?

• A. A rain gauge is more effective because it is easy for Grace, Mia, and Ava to use.

• B. A rain gauge is more effective because its installation is not expensive for their school project.

• C. A satellite is more effective because it gives real-time data for a large area, which can help Grace, Mia, and Ava in their project.

• D. A satellite is more effective because it helps delay an approaching storm, which is useful for their project.

Tags

NGSS.MS-ESS3-2

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

During a geography class, Benjamin and William were discussing the theories of scientists. Benjamin mentioned that Alexander von Humboldt theorized that South America and Africa were once joined. William added that Antonia Snider-Pellegrini found evidence that Europe and North America were joined.

Harper, who was listening to their conversation, asked them, 'Which theory, formulated by Alfred Wegener in the early 1900s, combined the evidence from both scientists and states that tectonic plates move apart?'

• A. Theory of Continental Drift

• B. Theory of Evolution

• C. Theory of Natural Selection

• D. Theory of Global Warming

Nora, Ethan, and Mia went on a field trip to a natural history museum. They saw a display about the rock cycle and fossils. How does the rock cycle they learned about relate to the fossil record they saw?

• Molten lava from a volcano they saw in a diorama preserves animal remains as igneous rock.

• Animal remains they saw in a display undergo intense heat and pressure and become preserved as metamorphic rock.

• Animal remains they saw in a fossil dig exhibit become part of sediment and are cemented and preserved as sedimentary rock.

• Heat and pressure from a volcano exhibit preserve animal remains as igneous rock.

Tags

NGSS.MS-ESS1-4

NGSS.MS-ESS2-1

NGSS.MS-LS4-1

Aria, James, and Aiden went on a field trip to a region where they saw a pair of springs. They noticed a continuous stream of water flowing from these springs through openings in the rock layers.

What could be the water source for these springs?

• A. The springs might have developed due to precipitation causing the surface runoff.

• B. The springs might have formed when the water table intersected with cracks in the surface, causing surface runoff.

• C. The springs might have formed due to vegetation bringing up water from groundwater.

• D. The springs might have developed because dry soil holds groundwater, which results in a spring that produces the surface runoff.

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-4

Elijah, Lily, and Samuel are discussing about the impact of extinctions on the environment. Which statement is true about extinctions in the context of their discussion?

• A. Elijah suggests that some extinctions can be reversed when environmental conditions change.

• B. Lily believes that some extinctions provide the opportunities for new species to thrive.

• C. Samuel thinks that extinctions only result from sudden, natural environmental changes such as volcanic eruptions.

• D. Lily argues that extinctions only result from gradual, man-made environmental changes such as global warming.

Tags

NGSS.MS-LS4-1

Benjamin, Aria, and Daniel are part of a school project where they have to advise a company on where to place its wave energy converter. The converter moves back and forth with ocean waves to produce electricity. They have four potential sites to choose from. Which site should they recommend to the company, and why?

• A. Site W; the site has the highest wave frequency, which moves the device more often, producing more electricity.

• B. Site X; the site is located on a barrier island that prevents the waves from reaching the coast, producing slower wave speeds, which will produce the most electricity.

• C. Site Y; the site has the highest average tidal differences, which covers the device with the most amount of water during high tide, producing more electricity.

• D. Site Z; the site is on an island chain in the ocean, resulting in the highest wave height, which will produce the most electricity.

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

Abigail and Olivia are in a music class. Abigail hits a drum with two different amounts of force and Olivia records the wave patterns for both trials in the table.

If Scarlett repeats the experiment and applies a different amount of force in Trial 3, what will happen to the wave pattern?

• The drum head will move for a longer duration, transferring the sound a shorter distance.

• The drum head will move a larger distance, transferring the sound a shorter distance.

• More energy will be transmitted through the wave.

• Less energy will be transmitted through the wave

Tags

NGSS.MS-PS3-5

NGSS.MS-PS4-1

In a science experiment, Ava, Abigail, and Evelyn are testing the loudness and pitch of sound. In Trial 3, Ava strikes a drum harder than she did in Trial 2. How would a listener hear the sound in Trial 3 compared to the sound in Trial 2?

• The sound will be louder.

• The sound will be softer.

• The pitch of the sound will be lower.

• The pitch of the sound will be higher.

Tags

NGSS.MS-PS4-1

Isla, Ethan, and Abigail live in a town where the local paper mill cuts down the forest to make paper from the pulp of wood. This has resulted in the destruction of the habitat of local wildlife. They are brainstorming solutions that would protect local wildlife while ensuring that the paper-making industry can continue. Which solution should they propose?

• Propose the paper mill to use agricultural waste such as corn husks for making paper.

• Suggest the paper mill to grow slow-growing trees on farmland for making paper.

• Advise the paper mill to remove all trees in a forest to make paper, then plant new trees.

• Recommend the paper mill to remove trees that are not used by wildlife for food to make paper.

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-5

Which illustration demonstrates reflection?

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NGSS.MS-PS4-2