This 4th letter of the Greek alphabet is used to describ a high-speed aircraft wing type
The focal length is the distance from the center of one of these to the focal point
Hirsutism is having more than the normal amount of this
This term refers to the warm periods within ice ages; we're in one of those periods now
When astronomers got a close-up look at this object in 1985-86, its nucleus looked like a big potato
The sling psychrometer & hair hygrometer are used to determine the relative amount of this
The Bay of Fundy is famous for its range of these, the widest on Earth
The Earth is surrounded by the magnetosphere, which is shaped by this particle stream
There are 2 major ice sheets on Earth; one covers most of Antarctica & the other most of this island
This 19th C. chemist, famous for a burner, devised a still-accepted theory on how geysers work