Question

1. cosmic microwave background radiation is best described as:

+1
a. energy left over from the early stages of the universe
b. signals from distant alien civilizations
c. radiation caused by modern satellite technology
d. light from the sun reflecting off the moon

1. when observing the light from a galaxy that is moving away from us, the light waves are:

a. compressed (blueshifted)
b. stretched (redshifted)
c. completely blocked
d. turned into x-rays

1. which phenomenon is directly related to earths motion in space?

a. volcanic eruptions
b. eclipses
c. the rock cycle
c. photosynthesis

Explanation:

1. For question 12: Cosmic microwave background radiation is a key piece of evidence for the Big Bang theory, originating as residual heat from the universe's early formation, stretched to microwave wavelengths by cosmic expansion.
2. For question 13: The Doppler effect for light dictates that light from objects moving away from an observer has its wavelengths stretched, which is called redshift. Objects moving toward an observer show blueshift.
3. For question 14: Eclipses occur due to the relative positions and orbital motions of Earth, the Moon, and the Sun, directly tied to Earth's movement in space. The other options are unrelated to Earth's spatial motion.

Answer:

1. A. Energy left over from the early stages of the universe
2. B. Stretched (Redshifted)
3. B. Eclipses