The rocks found in Greenland with carbon isotope ratios suggestive of life are
A) igneous
B) sedimentary
C) metamorphic
D) a mixture of sedimentary and metamorphic
B
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The center of our galaxy is believed to be occupied by the radio source known as ____________________
Fill in the blank(s) with correct word
As shown below, a garden room has three walls, a floor, and a roof, but is open to the garden on one side. The wall widths are L and w. The roof height is h. When traveling sound waves enter the room, standing sound waves can be present in the room if the wavelength of the standing waves is
?
?
A.
, where n is a positive integer.B.
, where n is an odd integer.C.
, where n is an even integer.D.
E.
Why does a reflection nebula look blue?
What will be an ideal response?
Two large parallel plates are separated by 1.0 mm of air. If the potential difference between them is 3.0 V, what is the magnitude of their surface charge densities? (?0 = 8.85 × 10-12 C2/N ? m2)
A) 2.7 × 10-8 C/m2 B) 1.6 × 10-4 C/m2 C) 5.3 × 10-8 C/m2 D) 3.3 × 10-4 C/m2