Answer to Question 1
When an air mass is heated, its density becomes lower than that of its surroundings, and buoyancy causes lower-density air to rise.
Answer to Question 2
Due to the curvature of Earth, the radiation reaching Earth at high latitudes is spread over larger areas than is the radiation reaching Earth at low latitudes. Each square meter of the surface receives proportionately less energy as we move to the higher latitude, and incoming solar flux thus decreases from the equator toward the poles.
Brain mass as a function of body mass in mammals.
Historian James Merrell notes several errors in Benjamin West’s famous 1771 painting, William Penn’s
The Number of Children Americans Think Are Ideal
The DNA from one chromosome has a mass of ~20 billion Daltons
Mass Wasting Triggers
Calculate the atomic mass of element