Less than 20 percent of Earth's magma extruded through volcanism occurs at oceanic spreading centers. Group startsTrue or False

About 80 percent of the magma reaching Earth's surface is basaltic, with only about 10 percent andesitic and 10 percent rhyolitic.Group startsTrue or False

Magma is created in different ways through melting inside Earth's interior. What type of melting occurs when volatiles are added?

The lowest temperatures and highest SiO2SiO2 contents occur in rhyolitic magma, material so viscous that it commonly does not flow.Group startsTrue or False

Chromosome duplication occurs prior to both mitosis and meiosis.Group startsTrue or False

The gene shuffling that occurs during meiosis allows two parents to produce genetically diverse offspring.Group startsTrue or False