TAMU Geology 101 Exam 2 questions with correct answers

General of magma CORRECT ANSWER igneous rocks form as molten rock (magma, lava) cools and solidifies General characteristics of magma Forms from partial melting of rocks Magma at surface is called lava Rocks formed from lava are extrusive/volcanic rocks Rocks formed from magma at depth are intrusive/plutonic rocks Basalt melt, Hawaii CORRECT ANSWER This is lava/melted rock. This shows Lava flow Basalt flow, Hawaii CORRECT ANSWER This also shows lava flow which is cooling instantly. Rhyolite flow CORRECT ANSWER This is old lava which at one time flowed very slowly. This is very very thick which is high in silica Magma CORRECT ANSWER Magma is a mixture, composed of: - Liquid melt - Solid crystals (usually, but not always present) - Gases (volatiles) dissolved in liquid Although it is a melt it still contains solids and gases inside of it -Gases inside include water vaport (H2O), carbon dioxide (CO2), and sulfur dioxide (SO2)