The presence of mud cracks in a sedimentary rock is a sign that the rock was deposited:a
in a region that was drying.
b. in a region that was under water.
c. in a desert.
d. beneath a glacier.
e. in a sand dune
A
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A. H-F B. H3C-CH3 C. CCl4 D. Cl-Cl E. F-F
Amphibians were the first organisms to live on land
a. True b. False
How would a Vulcanist explain the formation of rocks on primitive Earth?
What will be an ideal response?
Earth hits its perihelion position in January. Solar radiation is proportional to the distance squared between the sun and the earth, so why isn't it hot in "winter" at perihelion?
A) Precession modifies the effect as the earth wobbles on its axis. B) The ellipticity of the orbit is small, so the affect is small; seasons are caused by tilt of the earth's orbit. C) It is; it is called summer in the Southern Hemisphere, and there is just a time lag for the Northern Hemisphere. D) None of these is correct.