ZME Science on MSN5 个月
What are thundereggs? The rare, chalcedony-filled rocks
Thundereggs specifically form in rhyolitic lava. Rhyolitic lava flows are volcanic flows composed of rhyolite — a high-silica ...
EurekAlert!2 年
Trapped Magma May Be in 'Simmer' Mode Most of the Time (6 of 6) (IMAGE)
Caption Researchers sampling Kaharoa rhyolitic domes (lava flows) in this study. The rhyolite dome material (most of the field of view) is overlain by layers of basaltic tephra from the 1886 ...