2nd Semester Content Final - 6th Grade 2025

Soil is a mixture of weathered rock, mineral fragments, water, air and ___

• sand

• decayed organic matter

• moss

• clay

All of the following cause mechanical weathering EXCEPT ___

• ice

• tree roots

• burrowing animals

• carbonic acid

The difference between mechanical and chemical weathering is ___.

• the length of time each takes to break up a rock

• that only chemical weathering involves water

• the way they affect the makeup of a rock

• all of the above

Mechanical weathering ___

• breaks apart rocks by physical processes

• occurs when chemical reactions dissolve or change the minerals in rocks

• occurs when iron is exposed to oxygen and water

• none of the above

Tags

NGSS.MS-ESS2-2

Chemical weathering ___

• is caused by freezing and thawing

• breaks apart rocks by physical processes

• occurs when chemical reactions dissolve or change the minerals in rocks

• none of above

How long does it take for soil to form?

• a. a few hours

• b. a few days

• c. a few years

• d. thousands of years

Tags

NGSS.MS-ESS2-2

What happens during decomposition?

• Inorganic materials are broken down to create soil.

• Rocks are split into smaller pieces.

• Once living material is broken down into dark colored organic material.

• Dark colored soil absorbs sunlight.

Tags

NGSS.MS-ESS2-1

NGSS.MS-LS2-3

What is one way biota effect soil formation?

• The steepness of hills effects how much rock matter is carried away in water.

• Bacteria aid in the decomposition of organic materials.

• The cycle of freezing and thawing allows water in cracks of rock to expand and break apart the rock.

• As time passes, weathering is constantly acting on rock and sediment.

Tags

NGSS.MS-LS2-3

Which type of processes reshape Earth's surface?

• constructive

• destructive

• both a and b

• neither a nor b

Tags

NGSS.MS-ESS2-2

Where do erosion and deposition occur in a river?

• Erosion occurs as the moving river picks up soil and moves it downstream. Deposition occurs when the river currents slow as it enters the larger body of water and drops the soil.

• Deposition occurs as the moving river picks up soil and moves it downstream. Erosion occurs when the river currents slow as it enters the larger body of water and drops the soil.

• The river is eroding the land. There is no deposition.

• The delta forming at the mouth of the river is from deposition. There is no erosion.

Tags

NGSS.MS-ESS2-1

NGSS.MS-ESS2-2