Plate Tectonics / Boundaries Review
Earth's Layers Plate Tectonics Type of Plate Boundaries
Terms in this set (68)
What is Plate Tectonic Theory?
The formation and movement of the plates that cover the Earth's surface.
Who is Alfred Wegner?
The man who named the super continent, Pangaea.
What is Pangaea?
The super continent ( all the continents forming into 1 big continent).
What is the seven major tectonic plates?
1. North American 5. Indo - Australian
2. South American 6. Antartica
3. Eurasia 7. Pacific
What are the three types of plate boundaries?
Divergent, Convergent and Transform Boundary
What three geological features can happen at these boundaries?
Earthquakes, Volcanoism and Mountains
How do Tectonic Plates move?
Tectonic Plates move by the intense heat, from Earth's Core and Plasticity.
What forms at a divergent boundary?
It forms 2 Lithospheric Plates moving apart.
What forms at a convergent boundary?
It forms 2 Lithospheric Plates moving toward each other.
What forms at a transform boundary?
It forms 2 Lithospheric Plates sliding past each other.
Subduction is when a denser plate sinks underneath a less dense plate.
A solid that moves like a liquid.
Theory of the formation and movement of the plates that cover the Earth's surface.
The theory that all continents are fragments of Pangaea now drifting apart.
States that youngest rocks of ocean floor are at diverging boundaries, moving outward.
The outer shell of Earth that extends to a depth of 100 km.
A number of rigid, but moving, pieces of the Earth's surface.
The partially melted layer of the mantle that underlies the lithosphere.
Sphere of a solid nickle & iron @ the center of Earth surrounded by liquid outer core.
-Outer shell of Earth's core
-Surround inner core
-Made of liquid nickel & iron
-Solid layer of Earth between crust & core
-Made of dense sillicates
-Contains Athenosphere & Lithosphere
-Thin solid outermost layer of Earth
-Made of less dense sillicate
-Continental (land masses) or Oceanic (ocean bottom)
What change speed & direction depending on the density & material they travel through?
How does a geologist use earthquakes & surface rockes to observe Earth's interior?
Forces bring what that is formed deep within Earth to the surface?
Evidence suggests that Earth is formed of different materials in _______________?
How many layers does Earth have?
What layer of Earth has dense iron core; very hot & dense?
What layer of Earth has molten metal above the inner core?
What is the layer of Earth that flows slowly like putty?
What is the most outer layer of Earth?
Earth's structure-theories based on __________ of density, temperature, & pressure that changed with depth.
Earth's moving plates are sections of what?
What is considered to be the rigid upper part of the mantle and crust?
What are edges where plates meet called?
What are the effects of tension on plates?
Tension pulls plates apart.
What could cause mountains to form as rock crumbles & folds?
What occurs when a denser plate sinks underneath a less dense plate?
Shearing causes what & earthquakes as 2 plates slide past each other?
What theory states that the convection in the mantle circulates material & moves plates?
Plate Movement Theory
What at mid-ocean ridges causes plates to slide down the slope?
What happens as plates move away from mid-ocean ridges & become denser?
What is the solid layer with plasticisity in the upper mantle & is under the lithosphere?
What is the outermost layer of Earth that consist the Crust & the uppermost part of the mantle?
Earth's crust is divided into sections called what?
Plates move because of what in the mantle?
Where do plates move because of convection?
How far does tectonic plates move each year?
What did Alfred Wegner discover?
Continental Drift Theory
Who discovered the Continental Drift Theory?
What was Earth known as?
What is Pangea?
What Earth used to be called.
What happens when plates collide?
What can create mountains, earthquakes, & volcano activities?
Pressure from Convergent Boundary
What happens when 2 plates diverge (move away from each other)?
What happens in a Divergent Boundary?
-plates move away from each other
-melted rock from mantle can seep to the surface
Where is most of the Divergent Boundary?
in the ocean
What builds undersea mountain ridges called Mid-ocean Ridges?
What is it called when 2 plates slide past each other?
What happens in a Transform Boundary?
What forms from huge tilted blocks of rock separatedfrom surrounding rock by large faults?
What forms by compression forces folding rock layers?
What forces push up Earh's crust & allow the sedimentary rock to erode, leaving igneous or metamorphic rock?
Over time, layers of lava can form what?
Cone-shaped volcanic mountain
What formed by plumes of magma in the mantle can cause underwater volcanic mountains?
What principle indicates Earth's crust & lithosphere float on the upper mantle?
Earth's crust is ____________ under mountains.
When mountains erode, what happens to the Earth's crust when the weight has been removed?
Earth's crust rises.
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