EAS100 Lecture 15: EAS 201 - Midterm Review & Intro to Cryosphere

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EAS 201: Lecture 15
February 8, 2019
Midterm Review
Lithosphere records ‘magnetic stripes’ of normal and reversed rocks.
Magnitudes: energy released of magnitude 7 is ____ times greater than magnitude 5 =
900.
Increasing distance from a mid-oceanic ridge means rocks are older.
Polar-wander curves on continents show how continents have moved, or drifted,
relative to the magnetic poles.
Half-life of carbon-14 is ~ 5000 years, log found dated at 15000 years, what fraction of c-
14 remains (1/2 x ½ x ½ = 1/8).
The planets formed from the same cloud of gas & dust as the sun.
Inner and outer planets of solar system’s differences result of gradient in temperature
during formation.
Feldspar is dominant silicate in Earth’s crust.
Earth is ~ 4.5 billion years old.
Obsidian is NOT a mineral…
Amplitude of ground movement in magnitude 7 earthquake is 100 times greater than
magnitude 5.
Frost wedging is a physical weathering that increases surface area of rocks.
Rate of plate movement is ~ 2-5 centimeters per year.
Lecture Notes (borrowed from Karlis Muehlenbachs’ slides February 8, 2019)
Cryosphere: Glaciers & Glaciation
o Mass balance & glacier formation.
o Formation of glacier ice.
o Glacier flow & types.
o Glacial geology & geomorphology.
o Ice sheets & glaciation.
o Ice cores.
Glaciers are formed when the accumulation of snow is greater than its removal
(ablation) annually.
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