Answer:
Rocks are identified primarily by the minerals they contain and by their texture. Each type of rock has a distinctive set of minerals. A rock may be made of grains of all one mineral type, such as quartzite. Much more commonly, rocks are made of a mixture of different minerals.
Explanation:
6x^2 + 3xy - 2xy +y^2
6x^2 + xy + y^2
Answer: Because we don't want to use up all of the natural resources
Explanation:
The Volga river is the largest river in Europe, so that should be the answer.