humus-Humus is dark, organic material that forms in soil when plant and animal matter decays. When plants drop leaves, twigs, and other material to the ground, it piles up. 6 - 12+ Chemistry, Earth Science, Geography, Geology, Physical Geography.
TOPSOIL-Topsoil is the upper, outermost layer of soil, usually the top 5–10 inches. It has the highest concentration of organic matter and microorganisms, and is where most of the Earth's biological soil activity occurs.
subsoil-Subsoil is the layer of soil under the topsoil on the surface of the ground. Like topsoil, it is composed of a variable mixture of small particles such as sand, silt and clay, but with a much lower percentage of organic matter and humus, and it has a small amount of rocks which are smaller in size mixed with it.
bedrock- Bedrock is the hard, solid rock beneath surface materials such as soil and gravel. Bedrock also underlies sand and other sediments on the ocean floor. Bedrock is consolidated rock, meaning it is solid and tightly bound. Overlying material is often unconsolidated rock, which is made up of loose particles.
weathered rock-Weathering of rocks describes the process of weakening and breaking down of rocks and minerals. This can happen via both nonliving and living factors, such as temperature changes, plants and animals, acids, salts and water, whether solid or liquid. Weathering of rocks takes place over a period of time.
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humus-Humus is dark, organic material that forms in soil when plant and animal matter decays. When plants drop leaves, twigs, and other material to the ground, it piles up. 6 - 12+ Chemistry, Earth Science, Geography, Geology, Physical Geography.
TOPSOIL-Topsoil is the upper, outermost layer of soil, usually the top 5–10 inches. It has the highest concentration of organic matter and microorganisms, and is where most of the Earth's biological soil activity occurs.
subsoil-Subsoil is the layer of soil under the topsoil on the surface of the ground. Like topsoil, it is composed of a variable mixture of small particles such as sand, silt and clay, but with a much lower percentage of organic matter and humus, and it has a small amount of rocks which are smaller in size mixed with it.
bedrock- Bedrock is the hard, solid rock beneath surface materials such as soil and gravel. Bedrock also underlies sand and other sediments on the ocean floor. Bedrock is consolidated rock, meaning it is solid and tightly bound. Overlying material is often unconsolidated rock, which is made up of loose particles.
weathered rock-Weathering of rocks describes the process of weakening and breaking down of rocks and minerals. This can happen via both nonliving and living factors, such as temperature changes, plants and animals, acids, salts and water, whether solid or liquid. Weathering of rocks takes place over a period of time.
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