AK SCI Review - Earth & Space 2

What is the primary source of energy that drives the water cycle on Earth?

• The Moon

• The Sun

• Earth's core

• Ocean currents

Answer explanation

The primary source of energy driving the water cycle on Earth is the Sun. It heats water in oceans and lakes, causing evaporation, which is essential for the cycle.

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AK.SCI.6-8.MS-ESS2-4

Which process is responsible for the formation of sedimentary rocks?

• Melting

• Erosion

• Deposition

• Evaporation

Answer explanation

Deposition is the process where sediments are laid down in layers, leading to the formation of sedimentary rocks. Other processes like erosion and evaporation do not directly create sedimentary rocks.

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AK.SCI.6-8.MS-ESS2-1

Explain how the movement of tectonic plates can lead to the formation of mountains.

• Tectonic plates move apart, creating valleys.

• Tectonic plates slide past each other, causing earthquakes.

• Tectonic plates collide, pushing the Earth's crust upward.

• Tectonic plates sink into the mantle, forming trenches.

Answer explanation

Tectonic plates collide at convergent boundaries, causing immense pressure that pushes the Earth's crust upward, leading to the formation of mountains. This process is known as orogeny.

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Which of the following best describes the role of gravity in the water cycle?

• Gravity causes water to evaporate.

• Gravity pulls water back to Earth as precipitation.

• Gravity heats water in the oceans.

• Gravity causes water to freeze.

Answer explanation

Gravity plays a crucial role in the water cycle by pulling water back to Earth as precipitation, such as rain or snow. This process is essential for replenishing water sources and maintaining the cycle.

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Analyze the distribution of fossils and rocks to determine the past movement of continents.

• Fossils are randomly distributed and do not indicate past movements.

• Similar fossils found on different continents suggest they were once connected.

• Fossils are only found in oceanic regions, indicating no continental movement.

• Fossils are only found in polar regions, indicating past ice ages.

Answer explanation

Similar fossils found on different continents indicate that these landmasses were once connected, supporting the theory of continental drift. This distribution provides evidence of past geological movements.

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What is the main cause of ocean currents?

• The gravitational pull of the Moon

• The rotation of the Earth

• The unequal heating of the Earth's surface

• The salinity of ocean water

Answer explanation

The main cause of ocean currents is the unequal heating of the Earth's surface. This heating creates differences in water temperature and density, leading to movement in the oceans.

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Describe how the Sun's energy affects the cycling of Earth's materials.

• The Sun's energy causes rocks to melt into magma.

• The Sun's energy drives the water cycle, which contributes to weathering and erosion.

• The Sun's energy directly forms new minerals in the Earth's crust.

• The Sun's energy has no effect on Earth's materials.

Answer explanation

The Sun's energy drives the water cycle, leading to processes like evaporation and precipitation. This cycle is crucial for weathering and erosion, which break down rocks and transport materials, shaping Earth's surface.

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Which of the following is a result of the Earth's rotation affecting atmospheric circulation?

• The formation of glaciers

• The Coriolis effect

• The creation of mountain ranges

• The occurrence of solar eclipses

Answer explanation

The Coriolis effect is a result of the Earth's rotation, influencing wind and ocean currents. It causes moving air to turn and twist, affecting atmospheric circulation, unlike the other options listed.

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Construct an explanation for how volcanic eruptions can change Earth's surface.

• Volcanic eruptions release gases that cool the Earth's surface.

• Volcanic eruptions deposit lava that hardens into new landforms.

• Volcanic eruptions cause the Earth's surface to sink.

• Volcanic eruptions have no impact on Earth's surface.

Answer explanation

Volcanic eruptions deposit lava that cools and hardens, creating new landforms such as islands, mountains, and plateaus. This process significantly alters the Earth's surface over time.

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AK.SCI.6-8.MS-ESS2-2

What evidence supports the theory of plate tectonics?

• The presence of similar rock formations on different continents

• The uniform distribution of earthquakes worldwide

• The constant size of the Earth's oceans

• The lack of volcanic activity on Earth

Answer explanation

The presence of similar rock formations on different continents supports plate tectonics by indicating that these landmasses were once connected, allowing for the movement of tectonic plates over time.

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