What evidence did scientists use to develop the Law of Superposition? 1.Fossils and Rock Layers 2.Rock Layers only
3.Fossils only
4.Rock Layers and the environment

What evidence is there that convection occurs in earth’s troposphere?

Classify the descriptions and examples as endocrine or neural control

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?