When sound waves hit a solid surface they either reflect, refract, or absorb.
Echo's are caused by the reflection of sound waves.
An integrated explanation supported by extensive observation and experimentation and evaluated by the peer review process is called a scientific theory.
Peer review process is the system of analyzing and assessing the written manuscript before it is published in any journal. The process is performed to evaluate the dignity, originality and the significance of the manuscript. There are around 10 steps in the review process.
Scientific theory is a series of explanations for various facts and observations. The scientific theory should have some relevance, and if possible valid evidences as well. A theory can be proved even with the help of experiments.
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Answer:
Hypothesis
Explanation:
Since you are thinking it/guessing it with the knowledge you already have I think it’s hypothesis.
This is the definition of hypothesis if it helps: a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
Answer:
Energy can be neither created nor destroyed so the answer is D
