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Rheological Layers - ️️Lithosphere Asthenosphere Lower Mantle Outer Core Inner Core Continental Crust - ️️Density- 2.8 less dense Thickness- 35-40 km thicker Composition- Granite What Controls the rheology of a layer? - ️️Temperature, composition and pressure What controls land...

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  • October 17, 2024
  • 6
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • glg 112

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  • GLG 112 NAU
  • GLG 112 NAU

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GLG 112 Exam 1 NAU
Rheological Layers - ✔️✔️Lithosphere
Asthenosphere
Lower Mantle
Outer Core
Inner Core

Continental Crust - ✔️✔️Density- 2.8 less dense
Thickness- 35-40 km thicker
Composition- Granite

What Controls the rheology of a layer? - ✔️✔️Temperature, composition and pressure

What controls land elevation? - ✔️✔️Thickness and Density of lithosphere

Difference between a Compositional and Rheological Layer? - ✔️✔️Compositional is
the 3 layers, Rheological is the 5 layers

Compositional Layers - ✔️✔️Crust
Mantle
Core

Crust - ✔️✔️Earth's outermost layer. (Comp)

Mantle - ✔️✔️Earth's thickest layer made of hot rock and is less dense than the core,
less hot, and has less pressure on it. It also has plasticity (Comp)

Core - ✔️✔️Center of Earth (Comp)

Lithosphere - ✔️✔️A rigid layer made up of the uppermost part of the mantle and the
crust.

Asthenosphere - ✔️✔️The soft layer of the mantle on which the lithosphere floats.

Lower Mantle - ✔️✔️The lowest portion of mantle, a zone of rigid rock

Outer Core - ✔️✔️A layer of molten iron and nickel that surrounds the inner core of
Earth

Inner Core - ✔️✔️the molten core of the Earth.

, Tectonic Activity - ✔️✔️Activity resulting from tectonic plate movement, occurs where
plate boundries are

Do earthquakes and volcanoes always occur together? - ✔️✔️No

Continent fit - ✔️✔️Continents fit together like a puzzle


Oceanic Crust - ✔️✔️Density- 2.9 denser
Thickness- 7km thinner
Composition- Basalt

Fossil Species - ✔️✔️fossils found across the world can be found in other areas,
showing that they where once all connected

Rock Types and Land Forms - ✔️✔️Rock Types and Landforms match across
continents, which means they where one a single continent

Glacial Striations - ✔️✔️Scratches on rocks that match across the world

Magnetic Anomolies - ✔️✔️Polarity of magnetic seafloor

Hot Spots - ✔️✔️Place where magma has melted rock above it, forms

Global Tectonic Activity - ✔️✔️

What is convection in Asthenosphere? - ✔️✔️Just like heating water, hot magma rises,
cools, then sinks to the bottom. Repeated.

Convection Asthenosphere - ✔️✔️

Ridge Push - ✔️✔️the process in which new material at a ridge or rift pushes older
material aside, moving the tectonic plates away from the ridge

Slab Pull - ✔️✔️the pulling of a tectonic plate as its edge subducts deep into the mantle

Active Margin - ✔️✔️Typically has volcanoes, oceanic trenches and geological activity

Passive Margin - ✔️✔️Chill margin,

3 types of active margins - ✔️✔️Divergent, convergent, and transform

Divergent Plate Boundry - ✔️✔️Boundary between tectonic plates in which the two
plates move away from each other, and new crust is created between them

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