Watch the video and fill in the gaps.

[11:14] Soil is not just dirt, it is an important natural (1)_____________ that provides the foundation for life on Earth.

resource

the source

three sources

[11:33] Soil comes from weathered (2)_____________ that is broken down and moved through erosion.

nock

block

rock

[11:40] There are three levels of soil: topsoil, subsoil and (3)_____________.

heart rock

bedrock

hemlock

[11:45] Humus gives soil nutrients and is part of the (4)_____________.

topsoil

bedrock

nutrients

[11:54] There are three types of soil: sand, (5)_____________ and clay.

seed

silt

silk

[12:04] Silt has medium sized (6)_____________ and feels smooth.

articles

particols

particles

[12:09] (7)_____________ has the smallest particles and feels sticky.

clay

silt

sand

[12:14] Loam is a mixture of sand, silt, clay and (8)_____________ and is the best soil for growing plants.

brumous

humus

grumous

[12:27] Soil holds roots in place and roots help with soil (9)_____________.

corrosion

erosion

arrosion

[12:31] Worms make nutrient-rich castings. They also create tunnels that allow air and water to reach below the surface. Soil is used in many ways, including making (10)_____________for animals and people.

homes

holes

holds