University of Groningen
American History: Outlines: Basic Ingredients of the Us Economy
Every economic system tries to anticipate and then meet human needs through the production and distribution of goods and services. The economic system is the mechanism that brings together natural resources, the labor supply, technology,...
Huntington Library
Huntington Library: Seeds, Soil, and Surprises
This site has excellent resources for teaching students about plants. It has a guide to scientific investigation and a glossary of plant terms. There are three lessons that each include a slideshow on the parts of a plant, the needs of...