Why are relatively few details known about the life that existed on Earth prior to a few hundred million years ago?
A) Nearly all life at that time was microscopic, making it much more difficult to identify.
B) Older rocks are rarer than younger rocks because of geologic processes.
C) Many rocks have been transformed by high heat and pressure, destroying any fossils they contained.
D) All of the above are correct.
D) All of the above are correct.
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Sunspots are hotter than the photosphere
Indicate whether the statement is true or false
Folded rock layers that resemble a trough are called ______________
Fill in the blank(s) with correct word
Escape speed from the Sun is
A) about the same as from Earth. B) very much greater than for Earth. C) indefinite.
A long wire lies in a tangle on the surface of a table, as shown below. When a current is run through the wire as shown, the largest component of the magnetic field at X points
A. into the table. B. out of the table. C. parallel to the nearest segment of wire. D. antiparallel to the nearest segment of wire. E. along a circle which has its center at the center of the overall loop.