Science concepts

aExplains various components of a food chain and discusses the concepts of food webs, umbrella species, biogeochemical cycles, and more.

Explains photosynthesis, the process responsible for providing the material and energy for all living things, and discusses such related issues as respiration, the carbon cycle, acid rain, and the greenhouse effect.

Examines the changes in the atmosphere that produce various weather phenomena and how weather patterns over a period of time determine the climates of the Earth's various regions.

Explains the structure and function of DNA and discusses current relevant scientific research.

Explains different types of forces, how forces and simple machines work, the laws of motion, and how the laws act in different substances.

Profiles human discoveries involving space including discussions about stars, planets, and other celestial bodies.