A descriptive investigation usually starts with . A. making a hypothesis B. collecting observations and data C. deciding what information to collect D. seeing what conclusion the data supports

Which sentence best describes the formation of igneous rock? a- lava on the surface dries up and makes arock b_melted rocks cools and forms crystals c_rocks under tremendous heat and pressure d_magma is melted rock underground

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

Can someone me with questions 12 and 13 plz.