The lowest level to which a stream can erode is its
A. base level.
B. bedrock.
C. sediment capacity.
D. headwaters.
Answer: A
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In nature, chemicals are recycled rather than becoming waste.
Answer the following statement true (T) or false (F)
Why do ethers have lower boiling points than that of an alcohol of the same molecular weight?
A) Ethers cannot hydrogen bond to other ethers. B) Ethers do not have hydrogens. C) Ethers are more flammable and vaporize more easily. D) Ethers have higher boiling points than alcohols. E) all of the above
Which relative dating principle states that the youngest layer in a sedimentary rock sequence is on the top of the sequence and the oldest layer is at the bottom of the sequence?
a) principle of inclusion b) principle of original horizontality c) principle of cross-cutting relationship d) principle of lateral continuity e) principle of superposition
What is the term for vertebrates who have a skeleton made of cartilage?
a. Osteichthyes b. Chondrichthyes c. Reptilia d. Ophiuroids