Science chapter 1

the cycling of chemical elements through the living and nonliving parts of an ecosystem

• biogeochemical cycle

• water cycle

what are the four elements that re most abundant in living things

• Oxygen, Carbon, hydrogen, nitrogen

• Water, air, oxygen,cycle

Is the study of the world around us

• History

• Science

the precipitation that flows over the surface of soil

• runoff

• collection

process by which precipitation is gathered into a body of water

• runoff

• collection

the process that allows green plants to make sugars from sunlight,water, and carbon dioxide and that releases oxygen into the atmosphere

• cellular respiration

• photosynthesis

the process in cells by which oxygen and glucose are used to produce energy and carbon dioxide

• fossil fuel

• cellular respiration

a source of energy formed from dead plants and animals

• cellular respiration

• fossil fuel

the conversion of nitrogen in the atmosphere to a form that can be used by plants

• nodule

• nitrogen fixation

a plant that hosts nitrogen-fixing bacteria in nodules on its roots

• potatoes

• legume