NOTES AND STRUCTURED GEOLOGY
OVERVIEW GUIDE
◉ Which of the following igneous rocks crystallizes at the Earth's
surface? Answer: Basalt
◉ Minerals form as a result of: Answer: Crystallization from magma
Growth in the solid state
Precipitation from solution
ALL THE ABOVE
◉ The two characteristics used to describe a rock are: Answer:
Mineralogy and texture
◉ Where would you expect to find the largest crystals in a lava flow?
Answer: In the center of the flow
◉ Large igneous bodies that form at depth in the Earth's crust are
called ________. Answer: Plutons
, ◉ Andesite is an example of a _______ igneous rock. Answer:
Intermediate
◉ What is molten rock beneath the Earth's surface called? Answer:
Magma
◉ What is the name for a basaltic lava flow that has a ropy, folded
surface? Answer: Panhoehoe
◉ At what boundary within the Earth do we believe that mantle
plumes (hot spots) originate? Answer: Mantle-outer core boundary
◉ Which of the following igneous rocks has the lowest silica
content? Answer: Ultramafic
◉ What type of rock makes up most of the Hawaiian Islands?
Answer: Basalt
◉ What type of sediments are accumulations of solid fragments
produced by weathering? Answer: Clastic sediments
◉ Sedimentary basins are formed by a process called _______.
Answer: Subsidence