Exploring Earth's Water and Surface Changes

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

• It provides energy that causes water to evaporate.

• It pulls water down to the Earth's surface.

• It cools water vapor to form clouds.

• It absorbs water from the soil.

Answer explanation

The sun provides the energy necessary for water to evaporate, which is a key process in the water cycle. This energy heats the water, transforming it from liquid to vapor, allowing it to rise into the atmosphere.

Tags

NGSS.MS-ESS2-4

What is the primary force that causes precipitation to fall to the Earth's surface?

• Wind

• Gravity

• Sunlight

• Evaporation

Answer explanation

The primary force that causes precipitation to fall to the Earth's surface is gravity. It pulls the water droplets in clouds downwards, resulting in rain, snow, or other forms of precipitation.

Tags

NGSS.MS-PS2-4

Which process is responsible for breaking down rocks into smaller pieces without changing their chemical composition?

• Chemical weathering

• Erosion

• Physical weathering

• Deposition

Answer explanation

Physical weathering is the process that breaks down rocks into smaller pieces without altering their chemical composition, unlike chemical weathering, which changes the minerals in the rocks.

How does the addition of thermal energy affect the state of a pure substance?

• It always turns the substance into a solid.

• It can cause the substance to change from a solid to a liquid or a liquid to a gas.

• It decreases the temperature of the substance.

• It causes the substance to become denser.

Answer explanation

The addition of thermal energy can cause a pure substance to change states, such as from solid to liquid (melting) or from liquid to gas (vaporization). This is why the correct choice is that it can cause these changes.

Tags

NGSS.MS-PS1-4

Which of the following is an example of erosion?

• Water freezing in the cracks of rocks

• Wind carrying sand from one location to another

• Plants growing in rock crevices

• Rocks dissolving in acid rain

Answer explanation

Erosion involves the movement of soil and rock from one place to another. Wind carrying sand exemplifies this process, as it transports particles, reshaping landscapes. The other options describe weathering or biological processes, not erosion.

Tags

NGSS.MS-ESS2-2

What happens to water molecules when they are heated by the sun?

• They move closer together.

• They slow down.

• They move faster and spread apart.

• They turn into ice.

Answer explanation

When water molecules are heated by the sun, they gain energy, causing them to move faster and spread apart. This is why the correct answer is that they move faster and spread apart.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following best explains how glaciers can change the Earth's surface?

• By melting and forming rivers

• By depositing sediment as they move

• By freezing and thawing repeatedly

• By reflecting sunlight

Answer explanation

Glaciers change the Earth's surface primarily by depositing sediment as they move. This process, known as glacial deposition, shapes landscapes by leaving behind materials like rocks and soil, creating features such as moraines.

Tags

NGSS.MS-ESS2-2

What is the effect of removing thermal energy from a gas?

• The gas turns into a liquid.

• The gas becomes hotter.

• The gas expands.

• The gas turns into a solid.

Answer explanation

Removing thermal energy from a gas decreases its temperature, leading to condensation. This process causes the gas to turn into a liquid, making it the correct choice.

Tags

NGSS.MS-PS1-4

Which of the following processes is primarily responsible for the formation of sedimentary rocks?

• Melting

• Erosion

• Deposition

• Weathering

Answer explanation

Deposition is the process where sediments settle out of a transporting medium, leading to the formation of sedimentary rocks. While erosion and weathering contribute to sediment production, deposition is the key process for rock formation.

How does gravity affect the water cycle?

• It causes water to evaporate.

• It pulls water back to Earth's surface as precipitation.

• It heats water in the oceans.

• It turns water vapor into clouds.

Answer explanation

Gravity plays a crucial role in the water cycle by pulling water back to Earth's surface as precipitation, ensuring that water returns to rivers, lakes, and oceans, which is essential for the cycle to continue.

Tags

NGSS.MS-ESS2-4