Word: breccias
(lookup in dictionary)
(lookup stats)
Dates: during 1970-1979
Sort By: most recent first
(reverse)
...periodically-all forming new rock. For the last three billion years (the age of the youngest lunar rock) the only apparent changes on the moon have been caused by meteorites. Constant impacting by meteorites has broken up the rock to form dust, compacted the dust to form rocks called breccia, and melted the rock sand dust to form glasses...
| 1 |