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The very top layer, O, is the grass. The next layer, A, is called the topsoil. Beneath that is E, which is called transition. The next layer, B, is called the subsoil. From layers O and E is called the zone of leaching. from E to B is called the zone of accumulation. Next is layer C containing weathered parent material. Below all of that is a layer of bedrock.

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O horizon: Mostly humus, decomposed or partially decomposed organic matter. Usually found in forest soils
A horizon: Small mineral particles mixed with the broken down organic material from O horizon
E horizon: Very few nutrients found
B horizon: Subsoil, less organic material than horizon A
C horizon: Weathered parent material
R horizon: Bedrock

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water, eroded inorganic parent material, air, and organic matter

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Which one of the following is not a characteristic of the mantle?
(a) The mantle is the largest layer by volume of the earth.
(b) The mantle is solid except for a partially melted region in its upper part called asthenosphere.
(c) The upper mantle above the asthenosphere is considered part of the lithosphere.
(d) Large scale convection currents occur in the mantle.
(e) The mantle is dominated by aluminum rich minerals.

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Learn About Planet Earth - Structure of Earth

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Let's see what the earth is made of? Earth has three distinct layers and each of these layers has its own properties.