Archaeopteryx fossils are those of a prehistoric

a. bird.
b. crinoid.
c. trilobite.
d. ground sloth.


a

Physics & Space Science

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A rock sample contains 1/2 microgram of the parent radioactive isotope U-235 and 1/2 microgram of its daughter isotope Pb-207. If the half-life of this decay is 700 million years, how old is this rock?

A) 1400 million years B) 2100 million years C) 700 million years D) 350 million years

Physics & Space Science

The supermassive black hole at the center of the galaxy is:

A.) 15 light-years away. B.) 300 light-years away. C.) 8,800 light-years away. D.) 26,000 light-years away. E.) 90,000 light-years away.

Physics & Space Science

If Earth's mass were suddenly and magically reduced to half its present value, the Sun's gravitational force on Earth would

A. be reduced by a factor of 4. B. be reduced by a factor of 2. C. remain the same. D. increase by a factor of 2.

Physics & Space Science

The pupil of the eye increases in size under which condition?

a. eye is focused on a distant object b. eye is focused on a nearby object c. object viewed is dimly illuminated d. object viewed is well illuminated

Physics & Space Science