These are cracks in the earth's crust along wwhich movement takes place
What are faults
100
This causes magma to rise to the surface
What is gas within the magma
100
The idea of giant plates of rock moing slowly across Earth's structure
What are plate tectonics
100
These volcanos almost always have large craters at their summits. Mauna Loa is an example
What is a shield volcano
200
The solid upper mantle combine to form this thin rigid shell.
What is the lithosphere.
200
The point underground where faulting occurs
What is the focus
200
An opening in Earth's surface through which melted rock, hot gases.rock fragments and ash burst through.
What is a volcano
200
Alfred Weagner proposed this theory
What is the theory of continental drift
200
Hot magma beneath the Earth's crust pushes up through cracks or holes
What is how volcanoes are formed
300
Scientists study these boilingfountains to gain insight on what earth is like inside.
What are geyser
300
These waves travel along Earth's suface ery slowly. They cause the most damage of all the waes because they make the ground swell and roll.
What are L waes or surface waves
300
After an eruption a volcano collapses into a bowl shaped mouth called a _______. An example of this is ____________
What is a crater. Crater Lake in Oregon
300
There are two kinds of plates ________ and __________
the _________ plates are more dense
What are oceanic and continental plates. the oceanic plates
300
This volcano type consists of layers of lava mixed with sand and ash. They have moderately steep sides. An example is Mount Hood and Mount Shasta
What are Composite or Strato Volcanoes
400
This the thickest of Earth's layers
What is the mantle
400
An earthquakes energy or size is expressed as its________ and can be measured by a ____________ and recorded on a scale caleed the _______
What are magnitude,seismograph and richter scale
400
Although volcanoes destroy, how are they beneficial?
What are they bring new mountains,new islands, and new soil to the land.
400
There are three ways in which Earth's plates interact at their bondaries. Explain
What are diverging (2 paltes move away),converging(two plates move toward), and sliding 2 paltes move past each other in opposite directions)
400
Most volcanoes and earthquakes occur along the edge of the _________There are so many that the shoreline is called the ____________
What are pacific plates and the Ring of Fire
500
What parts of an egg are used to model Earth's structure
What is the shell is the crust, the egg white is the mantle and the yolk is the core.
500
When the crust shakes it sends out shock waves of energy called__________ The crust shakes due to ________
What are seismic waves. faulting which means that rocks are under much stress and the plates strain against each other. The rocks break and the plates move into new position
500
These volcanoes have slow thick moving lava that form steep sides. An example of this type is Mount St.Helens
What is a dome volcano
500
When a continental palte and an oceanic plate conerge the dense rock slides under the lighter rock. This is called
What is subduction
500
Volcanos that formed the Hawaiian Islands erupt even though they are in the middle of the Pacific plates not where two plates meet. How is this possible?
What is over the years eruption followed eruption and little by little thin layers of lava hardened atop another. Thousands of eruptions occured before they finally apperaed as islands The islands are the tops of gigantic olcanic mountains