Which of the following causes tornadoes
1. cool, dry air meeting warm , moist air
2. cool, moist air meeting warm ,dry air
3. typhoons losing energy over land
4. eastern air meeting western air

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount

Describe the interaction that occurs between two objects with the same electrical charge.

Which of the following did jj thompson discover about atoms? a)an atom has an internal structure. b) atoms are tiny indivisible particles. c)electrons orbit the nucleus of an atom. d) the nucleus of an atom contains protons and neutrons.