Arches National Park SCA

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After you've completed the Arches National Park unit, complete the assessment below.

Arches National Park in Utah is famous for having many natural rock arches made from sandstone. The picture below shows the process of creating these unique structures. Select the two main geological processes that create the arches. *

1 point

Weathering

Erosion

Deposition

Tectonic Movement

Volcanic Activity

Required

Which of the following examples best describes chemical weathering? *

1 point

Sediments being transported away in a stream

Sand being deposited on a river bank

Acidic rain reacting with minerals in a rock

Wind shaping rock over hundreds of thousands of years

Which of the following best describes the difference between erosion and weathering *

1 point

Weathering breaks down rocks and erosion carries the pieces of rock away

Weathering involves a chemical reaction and erosion does not

Weathering breaks apart rocks and erosion puts them back together

Weathering moves rocks around and erosion shakes pieces of rock loose

The photo below shows sediments in the shape of a fan. Which processes could be primarily responsible for this formation? *

1 point

High winds blowing into a valley shaped the sediments

Rocks breaking apart and the pieces falling into a fan shape

Water flowing down a stream and depositing sediment at the base

Rising flood waters bringing sand up from the bottom of the river

Most natural rock arches are made of sandstone and not limestone. What factor accounts for this difference? *

1 point

Sandstone tends to be younger rock and has less exposure to the elements

Sandstone forms arches because it's usually close to the surface

Sandstone doesn't react with water as easily as limestone

Limestone is much softer than sandstone

The picture below shows a section of river from above. How will sediment change how the river looks over time? *

1 point

Sediment will pile up in the middle, creating two seperate rivers

Sediment will dam the river and create a lake

Water will continue to flow faster until all sediments are taken out to sea

Sediment will be depsoited at the bends in the river, making it more curvy

When water seeps into the cracks of a rock and freezes, it expands. What will happen to a rock as the pattern of freezing and thawing continues over many years, and what type of geologic process does this demonstrate? (2 points) *

2 points

Human development has led to a lot of natural areas being paved over with concrete or blacktop. Identify the difference between surfaces as it relates to water absorption and problems paved areas can cause. Then explain why these problems are bad for humans and the environment, and a potential solution. *

4 points

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