Soil Horizons and Formation

A mixture of weathered rock, organic material, water and air is...

• a mineral

• a sedimentary rock

• soil

• the bedrock

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Soil formation begins with the weathering of_______.

• Humas

• Subsoil

• Litter

• Bedock

Tags

NGSS.MS-ESS2-2

Soil is made of

• weathered rocks and minerals
• dead plants and animals
• air and water
• all of the above

Tags

NGSS.MS-LS2-3

NGSS.MS-ESS2-1

Unweathered bedrock

• O Horizon

• A Horizon

• B Horizon

• C Horizon

• R Horizon

Organic materials dominate this horizon

• O Horizon

• A Horizon

• B Horizon

• C Horizon

• R Horizon

Young soil forms before the bedrock rock is weathered.

• True

• False

Which of the following places the sediments in order from SMALLEST to LARGEST?

• Silt, Gravel, Clay, Sand

• Clay, Silt, Sand, Gravel

• Gravel, Silt, Sand, Clay

• Clay, Silt, Gravel, Sand

What happens when there is too much erosion?

• topsoil cannot form, affecting the ability of crops to grow

• plants grow more effectively

• too much soil builds up along rivers

• trees break down bedrock at an increased rate

Tags

NGSS.MS-ESS2-2

Which soil particle has the highest infiltration rates?

• sand

• silt

• clay

• loam

Which soil particle has the lowest infiltration rates?

• sand

• silt

• clay

• loam