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What advantages do magnetic resonance imaging (MRI)and positron emission tomography (PET scan)offer in studying the brain?
Weathered Rock
Rock that has undergone physical or chemical breakdown due to atmospheric or biological elements, leading to changes in texture, composition, or color.
O Horizon
The O Horizon is the uppermost layer of soil, primarily composed of organic matter such as decomposing leaves and other plant material, crucial for nutrient cycling and soil fertility.
C Horizon
The layer of soil that consists of weathered rock and little organic material, often serving as the foundation of the soil profile.
A Horizon
The top layer of soil, known as topsoil, where organic matter decays and nutrients are readily available for plants.
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