#1. a reaction in which one element replaces another in a compound or in which two elements in different compounds trade places is called a reaction.
#2. the is the amount of one material present in a given volume of another material.

This element exists in adundance in the sun. explain how you would go about capturing sunlight. would this captured sunlight contain any of the element?

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils