What are liquid crude oil and petroleum made from?
a. small marine organisms
b. small land-based organisms
c. compressed rock and sediment
d. decomposing inorganic matter

Which of these conditions most likely produces an unstable isotope?

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Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this