Araneus diadematus: Information
Arapaima gigas: Information
Aratinga nana: Information
Arbacia punctulata: Information
Arborimus albipes: Information
Arborimus longicaudus: Information
An interactive applet and associated web page that demonstrate the concept of an arc. The applet shows a circle with part of it highlighted to identify the arc. Each endpoint of the arc can be dragged to resize it. The web page has definitions and links to the properties of an arc. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.
Living Atlas Indicators of the Planet provide the user with up-to-date data, maps, graphs, charts, animation and other visuals to explore the science of climate and environmental change. 18 indicators from Air Quality to Women in Parliament can be explored.
An interactive applet and associated web page that demonstrate the concept of arc length. The applet shows a circle with part of its circumference highlighted and the central angle shown. As the user drags either end of the arc it is redrawn and the calculation for arc length changes as you drag. The text on the web page gives the formula for calculating the arc length. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.
Archaeogastropoda: Information
Help students learn about archaeological methods and how archaeological interpretations are made. It is organized around questions that include: What is archeology? What do archaeologists do? How do archaeologists determine how old things are?
Archidoris montereyensis: Information
Archilochus alexandri: Information
Archilochus colubris: Information
The Gottscho-Schleisner Collection is comprised of over 29,000 images primarily of architectural subjects, including interiors and exteriors of homes, stores, offices, factories, historic buildings, and other structures. Subjects are concentrated chiefly in the northeastern United States, especially the New York City area, and Florida. Included are the homes of notable Americans, such as Raymond Loewy, and of several U.S. presidents, as well as color images of the 1939-40 New York World's Fair. Many of the photographs were commissioned by architects, designers, owners and architectural publications, and document important achievements in American 20th-century architecture and interior design.
Architeuthis dux: Information
Animal fact sheet
Animal fact sheet
In this audio slideshow, an ecologist from the University of Florida describes the radiocarbon dating technique that scientists use to determine the amount of carbon within the permafrost of the Arctic tundra. Understanding the rate of carbon released as permafrost thaws is necessary to understand how this positive feedback mechanism is contributing to climate change that may further increase global surface temperatures.
Arctictis binturong: Information