What do geoligists use to mark divisions in geologic time? No Files or links. 8th Grade Please help asap. A- Abrupt changes in the fossil record

B- Frequent episodes of climate change

C- movements of Earth's tectonic plates

D- Rates of radioactive mineral decay

Iwill give brainliest if you answer right : )

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.

Two balls, each with a mass of 0.5 kg, collide on a pool table. is the law of conservation of momentum satisfied in the collision? explain why or why not