Weathering, Erosion, and Deposition - Multiple Choice

A town builds a wall near a river to stop soil from washing away. What process are they trying to prevent?

• Weathering

• Erosion

• Deposition

• Melting

Answer explanation

The town is trying to prevent erosion, which is the process of soil being washed away by water. Building a wall helps protect the soil from the river's current, thereby reducing erosion.

A student sees a rock that is smooth and rounded. What most likely caused this change?

• Wind freezing the rock

• Plants growing on it

• Water wearing it down over time

• A person carving it

Answer explanation

The smooth and rounded appearance of the rock is most likely due to water wearing it down over time. This process, known as erosion, gradually shapes rocks by removing material, resulting in a smoother surface.

Which situation shows deposition?

• Rain falling on rocks

• Wind carrying sand

• Sand building up to form a dune

• Rocks breaking into pebbles

Answer explanation

Deposition occurs when materials settle and accumulate. 'Sand building up to form a dune' illustrates this process, as the sand is deposited by wind, creating a new landform. The other options do not represent deposition.

What tool would help you measure how much a cliff erodes each year?

• Thermometer

• Ruler

• Scale

• GPS and camera

Answer explanation

To measure cliff erosion, a GPS and camera can track changes in position and photograph the cliff over time, providing accurate data on how much it erodes each year. Other tools like a ruler or scale are not suitable for this purpose.

Why might plants be added to a hillside near a highway?

• To grow food

• To prevent erosion

• To provide shade

• To make it look pretty

Answer explanation

Plants are added to hillsides near highways primarily to prevent erosion. Their roots help stabilize the soil, reducing the risk of landslides and maintaining the integrity of the landscape.

What would happen if a large area of trees were cut down on a slope?

• More deposition would happen

• Less water would fall

• Erosion would increase

Answer explanation

Cutting down trees on a slope removes their roots, which help hold the soil in place. Without this support, the soil becomes more susceptible to erosion, leading to increased soil loss and potential landslides.

A scientist notices that a stream has changed its shape over time. What process most likely caused this?

• Weathering by ice

• Erosion by water

• Plant roots breaking rocks

• Earthquakes

Answer explanation

The stream's shape changed due to erosion by water, which gradually wears away soil and rock, altering the landscape. Other processes like weathering by ice or plant roots are less likely to cause significant shape changes in streams.

You want to find out which type of rock weathers the fastest. What should you do?

• Look at photos of different rocks

• Test different rocks with water and measure changes

• Ask a geologist

• Break rocks with a hammer

Answer explanation

Testing different rocks with water allows you to observe and measure the rate of weathering directly, providing empirical data on which rock weathers the fastest. Other options do not yield measurable results.

What would be the best evidence of deposition after a flood?

• Watermarks on buildings

• Mud and sand left in new areas

• Cracks in sidewalks

• Fallen trees

Answer explanation

The best evidence of deposition after a flood is mud and sand left in new areas, as these materials indicate where water has receded and deposited sediment. Watermarks show height but not deposition, while cracks and fallen trees are less direct evidence.

Which of the following would most likely increase the rate of erosion in a field?

• Planting grass

• Building a fence

• Adding pavement

• Removing vegetation

Answer explanation

Removing vegetation exposes soil to wind and water, increasing erosion rates. In contrast, planting grass and building a fence help protect the soil, while adding pavement can reduce erosion but does not directly increase it.