1. absolute time
2. relative time
spontaneous disintegration of the
atoms of certain isotopes into new
isotopes
dating a rock or mineral by
measuring the proportions of an original
radioactive material and its decay
product
geologic time measured in a
specific duration of years
placing events in chronological
3. radioactive decay
4. radiometric dating
order without reference to their ages
measured in years

1. absolute time

2. radioactive decay

3. radiometric dating

4. relative time

Explanation:

1. geologic time measured in a specific duration of years

 2. spontaneous disintegration of the atoms of certain isotopes into new isotopes

3. dating a rock or mineral by measuring the proportions of an original radioactive material and its decay products

4. placing events in chronological order without reference to their ages measured in years

it's c. (to reduce the greenhouse effect/carbon gasses)

the farther away the object is from the central star (the sun) it's gravitainal pull on the object is weaker when it is farther

explanation: