The Scientists
Plate Boundaries
SeaFloor Spreading
Volcanoes
Earthquakes
100
What scientist called his hypothesis continental drift?
Alfred Wegener
100
When plate boundaries come together
Converge
100
Who was the scientist that proposed a theory called sea floor spread?
Harry Hess
100
What is a volcano?
An opening in Earth that erupts gases, ash, and lava
100
What is an earthquake?
a sudden or violent shaking of the ground
200
Abraham O, a Dutch mapmaker, noticed the apparent fit of continents on either side of the _______
Atlantic Ocean
200
When plate boundaries move away from one another
Diverge
200
What happens during seafloor spreading?
Magma
200
An opening in a volcano is called what?
A vent
200
What causes an earthquake?
Movement in Earth's crust
300
What type of geologist was Eduard S.?
Austrian geologist
300
When plate boundaries move horizontally past one another
Transform
300
Seafloor spreading was the missing link needed by who? to complete his model of what?
Wegener, continental drift
300
What is a crater?
The steep walled depression around a volcano's vent
300
Where do earthquakes come from?
Three tectonic plates
400
In what year did Wegener present his idea about continental movement to the scientific community?
1912
400
Most are found on the sea floor, where they form ocean ridges
Divergent boundaries
400
As spreading along a ridge continues, more magma is forced _______ and ______.
Upward, hardens
400
What can form when oceanic plates start sliding below continental plates?
Mountain ranges
400
What tools and methods are used to predict this natural disaster?
Fossil seismograph
500
What was the name of the landmass named by Eduard that present southern continents had once joined?
Gondwanaland
500
This boundary is characterized by long faults and by shallow earthquakes
Transform boundaries
500
Magma is _____ and ________ than surrounding mantle material.
Harder and less dense
500
How are volcanoes formed?
When magma is forced up and flows onto Earth's surface as lava
500
What are the effects/impact on the environment?
Changes in landscape, landslides, and flooding
M
e
n
u