The spreading of sound waves around openings in barriers is called?
a. refraction
b. an echo
c. diffraction
d. reverberation

An easy way to calculate the amount of energy available at each level is to what?

Which identifies the main purpose of biological taxonomy?

The steps in the formation of extrusive igneous rocks are listed below in an incorrect order: 1. rock melts due to high temperature. 2. rock is buried deep under earth's surface. 3. magma is forced out of earth's surface during volcanic eruption. 4. lava cools and crystallizes to igneous rock. which of these best shows the correct order of steps in the formation of extrusive igneous rocks? 1, 3, 4, 2 2, 1, 3, 4 3, 4, 2, 1 4, 2, 1, 3