The era ended with the K-T mass extinction . A meteor is a meteoroid that has entered the Earth's atmosphere , usually making a fiery trail as it falls. It is sometimes called a shooting star. Most burn up before hitting the Earth . A meteorite is a meteor that has fallen to Earth .
Meteorites are either stone, iron, or stony-iron.
The micropyle is the a small pore in a seed that that allows water absorption. The Milankovitch Theory attempts to explain major temperatures changes on Earth, especially ice ages, by slight variations in the amount of sunlight reaching the Earth caused by the eccentricity of the Earth's orbit around the Sun. The Earth's orbital eccentricity changes the Earth's average distance from the sun and therefore slightly changes the amount of sunlight reaching the Earth. Milankovitch looked over the past 600,000 years and correlated summer temperature mimnima with four major ice ages in this time. Eccentricity cycles last over 100,000 years.