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.
[11:33] Soil comes from weathered (2)_____________ that is broken down and moved through erosion.
[11:40] There are three levels of soil: topsoil, subsoil and (3)_____________.
[11:45] Humus gives soil nutrients and is part of the (4)_____________.
[11:54] There are three types of soil: sand, (5)_____________ and clay.
[12:04] Silt has medium sized (6)_____________ and feels smooth.
[12:09] (7)_____________ has the smallest particles and feels sticky.
[12:14] Loam is a mixture of sand, silt, clay and (8)_____________ and is the best soil for growing plants.
[12:27] Soil holds roots in place and roots help with soil (9)_____________.
[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.