Amixture of two or more substances in which the molecules of the substances are evenly mixed is call a(

Ihave no idea how to solve these. plus there's another question that is 2) a 10 kilogram meteorite is collected in space and brought back to earth. it is composed of 1.25 kg of uranium-238 and 8.75 kg of lead-206. how many u-238 half lives have passed? what is the approximate age of the meteorite?

Which factor that affects biodiversity?

What is it called when lava when it erupts from the surface through volcanoes.