ancient granite crust is dated using potassium-40. Scientists find that 50% of the potassium-40 has decayed to form argon-40. Approximately how old is this rock

What is found within a ranger tower overlooking a drained lake

Extensive and unusual cold snaps have occurred here recently. is this evidence that global warming is lessening or not occurring? no—although the long-term trend is for warming, short-term weather patterns can still be variable. no—melting of glaciers and ice caps is making the oceans cooler, which can cause cold snaps. yes-- if global warming really were occurring, cold snaps wouldn’t happen. yes—due to global warming, weather patterns should be become less—not more—variable.

Witch of the following types of boundaries is most likely to result in a subduction zone