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WorksheetsIntroduction to Igneous Rocks
Total questions: 13
Worksheet time: 26mins
Why does oceanic plate sub-duct underneath the continental plate (check all that apply)
It is pushed by a mantle rock spreading along the mid-ocean ridge
It is dragged downward because it contains minerals that are less dense than continental rock
It is dragged downward because it contains minerals that are more dense than continental rock
It partially remelts to form felsic minerals
Earthquakes occur along the west coast when ____
The Pacific Plate slips along east-west fault lines with the Juan De Fuca Plate
Cascade Volcanic Arc periodically erupts overtime
The Juan De Fuca Plate breaks as it is subducted under the North American Plate
When magma solidifies into rock
The mantel is ____
solid and rigid
molten and plastic
cold and liquid
gaseous
Deep oceanic rock that is dark, coarse grained and dense is known as ______
Granite
Basalt
Gabbro
Andesite
Basalt lava that flows into the ocean is are quenched by cold seawater and forms ____
Obsidian
Gabbro
Scoria
Granite
Which mineral would not be likely found in a felsic rock? ____
Olivine
Quartz
Mica
Potassium Feldspar
This rock would be classified as a _________
Basalt
Gabbro
Rhyolite
Granite
This vesicular rock would be classified as _______
Obsidian
Granite
Scoria
Rhyolite
The three (3) types of volcanoes are ____ (mark all that apply)
Composite
Shield
Fissure
Cinder
Mount Mauna Loa has a height of _____ from its base to its peak.
29,000 feet
29,0000 meters
56,000 feet
24,000 feet
Composite or Stratovolcanoes are the most explosive type of volcano because ______ (check all answers that apply)
they contain lava underground
The potential for pyroclastic flows and lahars
they are made of basalt
Silica rich lava trap heat and gasses underground until catastrophic failure occurs
Rocky Butte in Northeast Portland is a ________
Shield Volcano
Composite Volcano
Hot Spot
Cinder Cone
Flood Basalt can be found throughout _____
The Columbia River Plateau
Mount Saint Helens
Mount Scott
The Columbia Bar
