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What types of lava flows are there?
Basaltic lavas (low viscosity), andesitic lavas (medium viscosity), rhyolitic lavas (high viscosity).
What is a common characteristic of basaltic lavas?
They form pahoehoe and aa flows and have low viscosity.
What are pyroclastic?
Fire fragments such as ash, glass, pumice, lapilli, cinders, blocks, and bombs.
What is the role of gases in volcanic eruptions?
Gases make up 1-5% of magma by weight, and contribute to eruption explosivity.