Answer:
The first layers of earth are very loose, unconsolidated layers called soil, which is pretty easy to dig into, but as we go deeper we reach the bedrock, which is the hardest part of the soil profile, which is made of hard rocks and matter.This makes it harder to dig more and more deeper.
Explanation:
I think it is control group
<span>According to PPACA, a health benefits exchange is basically a place where people go so they can sign up and pick from options for medical coverage. It is a marketplace where other companies battle each other for consumers.</span>
Greenhouse gases, such as carbon dioxide (CO2), trap heat from the Sun. This causes the Earth's climate to grow warmer, resulting in "global warming".