The answer is: "extended warranties"; which are actually called: "service contracts".
Answer:
Are you asking what she should do? If you're asking that i suggest whoever it is that got hurt to decide for herself. If the concussion is very bad and she have seen a doctor and they told you to sit out or something else then you should do as told. But if its mild, then she can know her limits and what she wants to do.
Explanation:
The nitrogen cycle is when nitrogen in the air is converted into a form that plants and animals can use; eutrophication is the build-up of nutrients, especially nitrogen in the water bodies such as rivers, lakes, and oceans, through runoff.
Magma from a reservoir deep in the Earths crust rises to the surface.