The Rio Grande River separates Mexico from Texas. What most likely created the riverbed?
A. glaciers
B. plate collisions
C. volcanoes
D. water erosion

Why do you think water is so important to living things

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

Look at the photo of the leaf. which term best describes this leaf?