The presence of ultramafic lava flows (komatiites)in the Archean suggest that mantle temperatures back then were ______ the temperatures today.
A)similar to
B)cooler than
C)much cooler than
D)hotter than

Question

Quizplus · Accepted Answer

Komatiites are ultramafic lavas that are formed at very high temperatures, much higher than those required to produce most other types of lava. Their presence in the Archean geological record suggests that the Earth's mantle was significantly hotter during the Archean eon than it is today.

The Presence of Ultramafic Lava Flows (Komatiites)in the Archean Suggest