Coal seams are far deep underground to be considered for opencast minings. These coal seams require underground mining. Since it is too deep underground, it can be used for mapping and correlation of sedimentary rocks or as a key bed.
I would think that an unweathered rock would be jagged while a weathered rock would be smooth because of water/wind or what ever weathered it.
Answer:
Hormones are substances produced by glands (or organs) that regulate bodily functions and behavior. Steroid hormones are one type that are chemically similar to each other, but may have different biological functions. For example, the adrenal glands produce an anti-inflammatory steroid similar to cortisone.
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Please mark me as brainliest</h2>
Answer:
it controls the heartbeat and movement of food
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Explanation:
Where is the picture? Is there a picture?
