PLS ANSWER FAST WILL GIVE Explain to me in YOUR own words, how convection currents create a cycle? In other words, tell me how heat and cooling create a cycle.

Need in all of themmm only answer if you know pls

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.