1. carbonaceous chondrites
2. laboratory measurement
3. seismic waves
those are the 3 ways af how scientist study it.
:)
Answer:
C. More people have moved to urban areas.
Explanation:
1. Coal is in the underground and we have to dig it out. Water is always there and circulating. Wind and Solar are things that have and will exist for a long time. We can use them and cycle them