Under Our Feet: Soil

Under Our Feet: Soil — page 3
SUPER SOIL AND MEGA MUD One gram of soil can hold between 5,000 and 7,000 types of bacteria Around 0 01 percent of the total water on Earth is stored in the soil It can take 500 years for nature to make just 1 inch 2 5 cm of topsoil learn more about topsoil on pages 10 and 11 Some of Earth’s soil is made of stardust The remains of stars get pulled to our planet by gravity 6 There’s so much to see Up here on the street But it’s even more interesting Under our feet