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What black volcanic glass is known for breaking with very sharp edges?
Answer
Obsidian
What Pacific belt contains about 75 percent of Earth's volcanoes?
Answer
Ring of Fire
What hot, fast-moving mixture of gas, ash, and rock fragments flows down a volcano?
Answer
Pyroclastic flow
What volcanic mudflow is made of water mixed with ash, rock, and debris?
Answer
Lahar
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What Pacific belt contains about 75 percent of Earth's volcanoes?
Answer
Ring of Fire
What hot, fast-moving mixture of gas, ash, and rock fragments flows down a volcano?
Answer
Pyroclastic flow
Which national capital hosts NATO's headquarters?
Answer
Brussels
Which capital city was known as Reval until 1918?
Answer
Tallinn
Which capital city lies on the Tiber River?
Answer
Rome
Which capital city is home to the Acropolis?
Answer
Athens