Science Ecoregions & Watersheds

What happens to a rock when it is weathered?

• It is broken into smaller pieces or dissolved.

• It is moved by wind, air, or water.

• It is built up as deposited material.

• It is changed into another type of rock.

Which are the main causes of the increase in the size of cracks, found in rocks, over time?

• ice wedging and wind abrasion

• plant roots and ice wedging

• animal burrowing and plant roots

• animal burrowing and wind abrasion

What often happens to rocks that undergo chemical weathering?

• They are transported.

• They produce acids.

• They become stronger.

• They change color.

The tallest sand dunes in North America are found in Great Sand Dunes National Park and Preserve in Colorado. These dunes were formed from the sand at the bottom of a dry lake bed. Which of the following agents is most likely responsible for the formation of the sand dunes.

• ice

• wind

• water

• gravity

The Llano Uplift is a series of granite hills that occur within the Edwards Plateau ecoregion. These hills are dome-shaped due to a slow process called exfoliation. What type of process results in exfoliation?

• deposition

• erosion by ice

• erosion by water

• weathering

Chemical weathering is different than mechanical weathering because it--

• breaks down rock

• moves rock from place to place

• changes the make up of rock

• makes new landforms

Which landform is formed by deposition of sediment?

• Canyon

• Delta

• Cliff

• Volcano

The number of plants have recently decreased in a particular area. This will most likely lead to a direct increase in--

• deposition of sand

• erosion of soil

• exfoliation

• weathering of rock

Sam has a vegetable garden in his yard. During a storm, heavy rain falls. The rain runs over the garden, and some of the soil is washed away. Which term best describes this movement of soil from one place to another?

• deposition

• discharge

• erosion

• weathering

Water can cause weathering, erosion, and deposition. Which of the following provides an example of water causing the weathering of rock?

• acid rain

• formation of floodplain

• rock landslide

• plant roots