Exam Questions
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Under what conditions does a rock melt?
If the temperature of rock rises above the melting point of the minerals the Rock is composed of
What are the major volcanic areas?
Boundaries of tectonic plates Mid-ocean ridge Subduction zones
When magma cools to quickly from an underwater volcano
Pillow lava
What are the signals of a volcanic eruption?
Change in the amount & composition of volcanic gases
Magma or igneous rock that is rich in magnesium and iron and is generally dark in color.
Mafic Lava
Magma or igneous rock that is rich in feldspar and silica and that is generally light in color
Felsic Lava
Fragments of rock that form during an volcanic eruption
Pyroclastic Materials
What type of eruption was Mt. St. Helens?
An explosive eruption
How was Iceland formed?
From volcanic eruptions on the mid - Atlantic ridge
What are the 3 primary tectonic zones?
Tectonic plates, subduction zones, and mid-ocean ridges
What events signal a volcanic eruption?
Changes in earthquake activity, volcano surface budges , and changes in gases emitted
Rope like dry magma that forms after mafic lava has cooled
Pahoehoe
A volcano active area of Earth’s surface far from a tectonic plate boundary
Hot spot
What do lichens and mosses produce that affect weathering?
Weak Acids
What are the agents of weathering?
Ice Plants and Animals Gravity Running Water And Wind
What things cause abrasion?
Gravity & Running Water
How does the amount of a rock’s surface areas affect weathering?
As rock breaks into smaller pieces, the surface area that is exposed increases. The larger the surface area ; the higher the rate of weathering .
What sedimentary rock weathers most quickly ?
Limestone & other sedimentary rocks that contain calcite
What climates have the fastest rate of weathering ?
Hot & Cold Weather
Parent rock that is rich in Quartz become soil that contains a lot of what?
Sand
What landforms are the result of weathering and erosion?
Mountains, plains, and plateaus
What farming methods conserve soil?
Crop rotation, contour plowing, and terracing
What are the forms of mechanical weathering?
Ice Wedging and Abrasion
What climates have the slowest rate of weathering ?
Hot, dry climates