Answer: Mechanical weathering breaks rocks into smaller pieces without changing their composition and chemical weathering breaks down rocks by forming new minerals that are stable at the Earth's surface.
Answer:
The National Research Act of 1974 set the stage for several important systems of checks and balances in clinical research. It led to the creation of the National Commission for the Protection of Human Subjects of Biomedical and Behavioral Research, as well as the Belmont Report and Institutional Review Boards (IRBs).
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The Chernobyl nuclear power plant meltdown is not considered a natural disaster because it is caused by something that was made by humans.
True
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