This site from Wikipedia gives a comprehensive overview of capital. Includes many economic terms with links for further clarification. A good analysis of multiple aspects of capital.

Article describing the scope of the problem of overfishing in the ocean and in fresh water bodies around the world. Adverse effects of this practice on both natural and human systems, and efforts to contain it are detailed. (Published:...

Extensive article on mangroves. Covers classification, physical characteristics, life cycle, habitat, economic value, and natural and human threats to their survival.

Students are introduced to the concept of light pollution by investigating the nature, sources and levels of light in their classroom environment. They learn about the adverse effects of artificial light and the resulting consequences on...

Students discover the mathematical constant phi, the golden ratio, through hands-on activities. They measure dimensions of "natural objects"--a star, a nautilus shell and human hand bones--and calculate ratios of the measured values,...

A large collection of lessons on prairie agriculture for Pre-K to Grade 12, organized into grade level groups. They cover such topics as foods that come from agriculture, animal farming, soils, and environmental issues. These lessons on...

In this video segment from Nature, learn about the role of dogs in the lives of humans.

Tropical rainforests are found along the Earth's equator. They possess a very special climate and are an integral part of the planet's natural system. Climate, plant and animal life, and indigenous peoples are discussed. Additionally,...

Comprehensive guide with 17 areas of suggestions and tips for delivering a successful class presentation. Requires Adobe Reader. [PDF] CCSS.ELA-Literacy.CCRA.SL.4, SL.11-12.4 Presentation

Why is ozone important? Learn about the ozone layer in our atmosphere, how it is being depleted by human and natural events, the effects of a thinning ozone layer on humans and other living things, what is meant by the ozone hole, and...

This site provides real-world issues as well as the scientific research and technology used to support the EPA's mission to protect human health and safeguard the natural environment.

In this activity, you will study and analyze the nature and patterns of human population growth over the last 10,000 years. This will help you understand the differences between population growth before and after the Modern Revolution.

Gather information about forest fires including major human and natural causes, how they spread, firefighters, campfire safety, fun facts, and good wildfires on this site.

Read about the economic downturn of the 1970s and the OPEC oil embargo of 1973-1974.