Which of these best describes erosion?
A.) the natural wearing down of rock into smaller pieces due to abrasion
B.) the movement of rock and sediment due to wind, water and other forces
C.) the chemical composition of a type of rock
D.) the natural features of the Earth’s surface, such as mountains and canyons

Beth’s hygrometer is reading a temperature of 30 c and a relative humidity of 65%. the humidity in the air is?

The human genome project is devoted to mapping the general dna sequence of our species. this could lead to the development of new medicines, as well as the possibility of using gene therapy to treat certain diseases. however, there are some ethical issues surrounding the mapping of individual genomes. one concern is a) that your genes may change over time, making the project useless. b) that insurance companies could discriminate based on genetic make-up. c) that since this has never been done before, we should probably not do it now. d) that sequencing our individual genomes is so expensive, it is a counter-productive strategy.

What are some natural processes that represent physical and chemical changes?