BEDROCK - It's the last layer and it's made out of rock, pebbles and sand., TOPSOIL - It's made out of humus. Seeds germinate and roots grow in this dark layer of soil., SUBSOIL - There are a lot of living creatures in this layer, such as bacteria, worms and fungi., MIDDLE LAYER - Made out of sand and silt, in this layer there's little oxygen and plants don't grow well here,

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