14 sub-categories under Sciences and Educational Resources:

Astronomy (4)
Atmospheric Sciences (12)
Biology (35)
Biotechnology (4)
Botany (2)
Chemistry (5)
Ecology (30)
Geography (7)
Geology (6)
Meteorology (1)
Oceanography (2)
Ornithology (4)
Paleontology (0)
Physics (3)