What type of thunderstorms do tornadoes come from most often? Air Mass/Moist-cell
Frontal/Super-cell
Air Mass/ Super-cell
Air Mass/ Frontal

Ialready know the answers to these questions and they are on the attachment. but i just need to know why that answer is the correct one. plz asap! this is for a report that i need to email by 10!

What are levels of ecology and how can we remember them

The table below shows the elements that mainly comprise each of the four layers of earth: elements in layers layer main elements crust oxygen, silicon mantle iron, magnesium outer core iron, nickel inner core iron which of these elements make up the layer that is 0.2 to 1.1 percent of earth's total diameter?