Khan Academy Soils

What are soils made from? Choose all the correct answers.

• minerals from rocks

• water

• air

• organic content

• magma

This pie chart shows the soil composition in general. What's A?

• Minerals

• organic content

• humus

• water

Look again. What's B? Find all correct answers

• minerals

• organic content

• humus

• water

Tags

NGSS.MS-ESS2-4

NGSS.MS-LS2-3

NGSS.MS-LS2-4

In a soil sample, where do the minerals come from?

• living things

• plants

• rocks

• water

Which mineral has the largest particle in a soil?

• sand

• silt

• clay

Which soil component has the smallest particle?

• silt

• sand

• clay

Which soil component is coarse and gritty?

• clay

• silt

• sand

Ms Sisca adds water to a type of soil and leave it overnight. What is floating on the water surface?

• sand

• silt

• humus

• clay

What is humus?

• sand

• silt

• clay

• organic content

Tags

NGSS.MS-LS2-1

Look at the soil sample. What type of soil is that?

• loam

• sandy

• clay