Most scientific questions are based on

Most scientific questions are based on observations. Scientists observe something repeatedly, and they do the experiments over and over again, so as to get to the bottom of some of their questions. 

By sj wilson · 2005 ·  related articlesschool violence prevention programs fell into four broad categories: universal interferes with their efforts to teach. program for children attending any grade, pre-k through 12th 

Magma  is composed of molten rock and is  stored  in the earth's crust. lava is  magma  that reaches the surface of our planet through a volcano vent.