Final answer:
The four U.S. states with volcanic activity in the 1900s are Alaska, California, Hawaii, and Oregon.
Step-by-step explanation:
Four U.S. states with volcanic activity in the 1900s include:
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- Alaska: Alaska has had various volcanic eruptions throughout the 1900s, including the 1912 eruption of Novarupta, which was one of the largest eruptions in recorded history.
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- California: California is home to the Lassen Volcanic Center, which has experienced multiple volcanic eruptions, including the eruption of Lassen Peak in 1915.
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- Hawaii: The Hawaiian Islands have ongoing volcanic activity, with Kilauea being one of the most active volcanoes in the world throughout the 1900s.
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- Oregon: Oregon has several volcanic features, including Crater Lake National Park, which was formed by the collapse of a volcano and subsequent caldera formation.