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A psychologist flashes a sequence of five letters (such as STWLG) on a screen in front of you and then asks you immediately to count backward from 1000 by 7s. After a few seconds, she asks you to recall the five letters. This psychologist is most likely studying the ________.
C Soil Horizon
The layer of soil that consists of weathered parent material, lying beneath the A (topsoil) and B (subsoil) horizons.
Weathering
Weathering is the process by which rocks, soil, and minerals are broken down by the Earth's atmospheric and biological conditions, such as temperature changes and chemical reactions.
Parent Material
The underlying geological material (generally bedrock or a superficial or drift deposit) in which soil horizons form.
Iron Oxide
A chemical compound made of iron and oxygen, commonly found in rust and various minerals, and used in numerous industrial applications.
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