GED Science Practice

What lies beneath surface deposits of soil and is solid unweathered rock?

1. Autotroph

2. Auxin

3. Bedrock

4. Bacteria

The correct answer is: Bedrock

The correct answer is indeed bedrock. Bedrock refers to the solid rock layer that lies directly beneath the surface deposits of soil. This layer is typically unweathered and can vary in composition, forming the foundational structure upon which soil and other geological materials rest. Understanding bedrock is essential in fields like geology and environmental science, as it influences soil formation, stability, and even vegetation growth. The other options do not relate to the definition of solid, unweathered rock beneath the soil. Autotrophs are organisms that produce their own food, such as plants, while auxins are a type of plant hormone that regulates growth. Bacteria are microscopic organisms that are essential for various biological processes but do not encompass the concept of a solid rock layer beneath soil. This distinction clarifies why bedrock is the most accurate choice.