Before a chemical reaction can start, must be absorbed by the reactants. the amount that must be absorbed to start the reaction is called the

Imagine a rocket launching from earth and travelling to the moon. in which order would the rocket pass through the layers of the atmosphere? thermosphere, mesosphere, stratosphere, troposphere troposphere, mesosphere, stratosphere, troposphere thermosphere, stratosphere, mesosphere, troposphere troposphere, stratosphere, mesosphere, thermosphere

What is thought to have caused the mass extinction at the end of the cretaceous period?

The tubes transporting minerals and water upward are called ?