Exploring Science: 8th Grade Quiz

What is the primary source of energy for most ecosystems on Earth?

• The Moon

• The Sun

• Volcanoes

• Ocean currents

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Emma is having a campfire with her friends. Which of the following is a chemical reaction?

• Melting ice

• Burning wood

• Dissolving sugar in water

• Breaking a glass

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Identify the layer of Earth that is composed mostly of liquid iron and nickel.

• Crust

• Mantle

• Outer core

• Inner core

Which biome is characterized by low temperatures and permafrost?

• Desert

• Tundra

• Rainforest

• Grassland

Kai and Harper are studying the effects of deforestation in their local area. Explain how deforestation can impact the carbon cycle.

• It increases carbon storage in trees.

• It decreases the amount of carbon dioxide in the atmosphere.

• It increases the amount of carbon dioxide in the atmosphere.

• It has no effect on the carbon cycle.

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Which of the following best describes the process of photosynthesis?

• Conversion of chemical energy into light energy

• Conversion of light energy into chemical energy

• Conversion of thermal energy into mechanical energy

• Conversion of mechanical energy into thermal energy

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Describe how the motion of tectonic plates can lead to the formation of mountains.

• Plates move apart, creating valleys.

• Plates slide past each other, causing earthquakes.

• Plates collide, causing the crust to buckle and form mountains.

• Plates sink into the mantle, forming trenches.

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Draw a waxing gibbous moon.

Answer explanation

A waxing gibbous is nearing a full moon. The right hand side of the moon is illuminated during the waxing phases.

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Which of the following is an example of a renewable energy source?

• Coal

• Natural gas

• Solar power

• Nuclear power

David runs a distance of 150 meters in 10 seconds. Calculate his speed.

• 10 m/s

• 15 m/s

• 20 m/s

• 25 m/s

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