题目内容
The most abundant elements from No. 1 to No. 10: ______ ，______ ，Al, Fe, ______ , Na, K, ______ , Ti, H.
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Tidal flats, lagoons, and deltas are examples of transitional environments.
Reverse faults are usually produced by compressional forces.
The following is a sketch diagram showing different contact relationships, between which layers you may find the intrusive contact, angular unconformity and the conformity?
Nonconformity is also called sedimentary contact and disconformity is called parallel unconformity.
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