When magma erupts onto the earth’s surface it is known as
Lava
100
The theory that Earth's outer shell is divided into several plates that glide over the mantle is known as _____ _____ theory
Plate Tectonics
100
When a plate meets another plate and “submerges” under the other, it forms a ________ zone.
Subduction
100
Broad, gently sloping volcanoes with quiet eruptions are called _______.
Shield Volcanoes
100
Basaltic magma forms when rocks in the _____ ______ melts.
Upper Mantle
200
The general term for fragments of volcanic rock and lava that are blasted into the air explosions
Tephra
200
When new plates are formed (in the mid atlantic ridge for example) and spread apart, these plates are said to be _______ plates.
Divergent
200
Land feature that forms with two oceanic plates converge and one is subducted into the mantle
Island Arcs
200
Hawaiian islands are volcanoes created by ___ ____.
Hot spots
200
Which type of volcano typically has a short life span? (As exemplified by the volcano in Mexico that grew and was active for 9 years).
Cinder cone
300
A mixture of molten rock, suspended minerals, and gases
Magma
300
According to the theory of plate tectonics the there was once a super-continent that broke into smaller continental plates known as___________?
Pangea
300
Large mountain ranges are formed at ________ boundaries.
Continental-continental Convergent
300
Mt. St Helens was the largest eruption in the United States on record. What type of volcano is it?
Strato or composite volcano
300
75 - 80 % of the world’s active and dormant volcanoes can be found along a ring of subducting plates known as the______?
Ring of Fire
400
The most explosive volcanoes
Stratovolcanoes or Composite Volcanoes
400
San Andreas fault is an example of a plate that is sliding past another plate. This type of plate tectonic motion is known as ___________?
Transform
400
Early mapmakers though continents might have moved based on their observations of
Matching coastlines
400
Volcanoes can be in three states, including "sleeping" or active. What are the three states of activity of volcanoes?
Active, dormant, extinct
400
There are classified two types of plates. The plates are distinguished by the materials they are made up of. What are those 2 types of plates known as?
-Daily double-
Continental and Oceanic plates
500
Forms when the top or side of a volcano collapses into the magma chamber
Caldera
500
New ocean crust forms at _________ boundaries
Divergent
500
What did Alfred use to support his hypothesis of continental drift?
Climatic evidence, fossil evidence, and rock formations
500
The magma that forms depends heavily on its _______ content.
Silica
500
An intrusive igneous rock body is called a _______.