What is the evidence to support the existence of a black hole at the center of the Milky Way?
What will be an ideal response?
A large amount of activity is present. There is evidence of strong magnetic fields, X-ray sources, extremely high stellar densities, an extremely energetic accretion disk, the strongest source of radio waves in the sky, and the stars and gas speed up as you get close to the core.
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________ is responsible for heating the Earth's interior today
Fill in the blank(s) with correct word
If the tilt of Earth's rotation axis was increased from 23.5° to 40°, what would we expect to change?
A) Seasons on Earth would become more extreme (hotter summers, colder winters). B) Seasons on Earth would become less extreme (cooler summers, warmer winters). C) The Earth would not experience seasons anymore. D) Nothing would change about weather on Earth.
If a sound level increases by 20 dB, the intensity increases by a factor of _______.
a. one thousand b. one hundred c. ten d. ten thousand
One kilogram of peaches has more skin area than one kilogram of
A) blueberries. B) grapefruits. C) grapes. D) all of the above