What is the significance of the 'Four Corners Monument' located at the intersection of four U.S. states?

It signifies the westernmost point of the original thirteen colonies.

It represents the highest elevation in the United States.

It is the only point where four state boundaries meet.

It marks the geographic center of the contiguous United States.

The state of Oregon is renowned for Crater Lake, which is recognized as the deepest lake in the United States. What formed this lake?

A dam built across a major river system.

A massive glacial excavation during the last ice age.

Tectonic plate movement creating a deep rift valley.

The collapse of a volcano, forming a caldera.

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