What sedimentary rock type was formed entirely by mechanical processes?
A. gneiss
B. clastic
C. schist
D. organic
E. chemical
B
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Why are elements heavier than iron less abundant than those that are lighter?
A. This is one of the mysteries of cosmic formation that has yet to be answered. B. Because they tend to be unstable, and easily undergo fission C. Because the duration of a supernova is relatively short D. Spectral evidence suggests they are only rare here on Earth.
The Earth's rotation is gradually slowing
Indicate whether the statement is true or false
The Tyndall effect is associated with which of the following?
A) keeping colloidal particles from settling B) light scattering by colloidal particles C) both a and b D) neither a nor b
Currently there are no proven strategies to protect against shoreline erosion.
Answer the following statement true (T) or false (F)