A circuit is a pathway for electric current to follow. Plants and Animals Living things have certain characteristics that distinguish them from non-living things. Complex living things undergo certain processes that enable them to survive and reproduce. Earth's Oceans Ocean water has definite physical and chemical properties. Earth's water undergoes a predictable cycle.
Oceans have a pattern of circulation.
A variety of life forms reside in Earth's oceans. The ocean floor has a variety of geologic features. Humans are dependent upon oceans and their natural resources. Properties of Matter Matter is everything in the universe that has mass and takes up space. The nature of matter is determined by the types of atoms present and the bonds between them.