The transition from the Archean Eon to the Proterozoic Eon occurred because:

WHY is the Sahara a desert?

Why are we not able to radiometrically date sedimentary rocks directly?

Basaltic lavas ____________.

A combination of surface currents and vertical thermohaline circulation acts like a conveyor belt and moves water and heat among ocean basins and from ocean surface to ocean floor.

How do we determine the location of a recent earthquake?

During which geologic time period was the Earth’s interior so hot that a solid outer crust, if present, was likely being extensively remelted?

All volcanoes produce effusive streams of lava like Kilauea volcano in Hawaii.

In this figure, which is older? The granite or the conglomerate?

Ice core data show that atmospheric CO2 concentrations were higher during each of the major glacial periods and lower during the warmer interglacial periods.