|
|
|
Jurassic
|
A period in the geologic time scale that spans from 208 to 144 million years ago.
|
|
|
|
|
joint
|
A large and relatively planar fracture in a rock across which there is no relative displacement of the two sides.
|
|
|
juvenile gas
|
Gases that come to the surface for the first time from the deep interior.
|
|
|
jökulhlaup
|
Icelandic term for glacial outburst flood. Jökulhlaup's are sudden outbursts of water released by a glacier. The water may be released from glacier cavities, sub-glacial lakes, and from glacier-dammed lakes in side valleys.
|
|
