1. how did astronomers confirm the existence of dark energy?
a. by calculating it using kepler’s third law
b. by measuring the mass of galaxies
c. by detecting it with telescopes
d. by the ages of globular clusters

2. how did astronomers confirm the existence of dark matter?
a. by measuring how fast the universe is expanding
b. by detecting very hot gas in galaxy clusters that emits x-rays
c. by measuring the amount of compressed gas in the universe
d. by detecting electromagnetic radiation reflecting from the dark matter

1. d

2. b

Explanation:

Dark energy is defined as the unknown energy that has an immense impact on the universe. It was first observed from a supernovae measurements, which showed evidence that the universe's expansion was accelerating.

Dark matter makes up approximately 85% of the universe's matter, it is defined as a invisible component that interacts with visible matter through gravity.

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.