Ask an Expert in Math and Science

General Science

Scientific American's Ask an Expert	Ask-a-Scientist	Ask How Things Work	Ask a Population Genetist	Ask a Mad Scientist -- Many different topics
Department of Atmospheric, Oceanic and Space Sciences College of Engineering	List of Universities online	Ask a Remote Sensing Scientist	Ask Professor Science	Ask a Science Question
Dr. Universe (K-6)

Astronomy and Space Science

Ask the Space Scientist

Ask a NASA Scientist

Ask an Astronomer

Ask an Astronaut

Ask an Astronomer

Biology and Life Sciences

Ask A Water Testing Expert	Ask a Bird Expert	Ask a Plant and Animal Expert	SchoolWorld Zoo Experts	Ask a Biologist (Scientific American)
Ask a Health Expert	Plant & Pest Diagnostic Laboratory Experts	Ask a Biologist (Arizona State University)

Physics

Ask Physics Questions

Ask a Physical Scientist - Physical Sciences

Ask a Plasma Physicist

Oceanography

Ask Shamu -- SeaWorld (questions about ocean or marine animals) (K-6)

Ask Jake the Sea Dog -- Whaletime (questions about ocean or marine animals)

WhaleNet A.S.K. "Scientist of the Week"

Geology

Ask a Geologist -- United State Geological Survey	Ask an Earth Scientist -- Dept. of Geology and Geophysics at U. of Hawaii. Faculty experts on volcanoes, geochemistry, geophysics, earthquakes, minerals & gems, sediments & sedimentary rocks, hydrology and natural hazards.	Ask a Geologist -- Geological Survey of Canada	Ask a Geologist -- Geological Survey of Canada (Atlantic)
Ask a GIS Expert -- GIS Think Tank at the U.S. Fish and Wildlife Service	Ask a Volcanologist -- Volcano World	Mineral Resource Specialist Directory -- United State Geological Survey (USGS)	Ask a Diamond Expert -- Van Daaz diamonds
Ask a Diamond Expert - DiamondTalk.com	Ask a Paleontologist -- Illinois State Geological Survey (Dino Russ' Lair)	Lamont-Doherty Earth Observatory -- Columbia University	Ask a Gemologist

Weather

Ask a Weather Expert

Ask a Hurricane Hunter

Mathematics

Ask Dr. Math

Math Forum

Math.com

Ask a Math/Science Expert

Ask A Science/Math Expert (K-6)