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

Physics & Space Science

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Why does a reflection nebula look blue?

What will be an ideal response?

Physics & Space Science

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.
in all cases listed above.

E.
given by (a) or (b) above, but not by (c).

Physics & Space Science

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

Physics & Space Science

The center of our galaxy is believed to be occupied by the radio source known as ____________________

Fill in the blank(s) with correct word

Physics & Space Science