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Geology: Unconformities & Rocks

A closer look at unconformities
by

Teika Clavell

on 26 October 2014

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Transcript of Geology: Unconformities & Rocks

Ulleung Island
South Korea
San Francisco
California
Geology: Unconformities & Rocks
Radio Active Age Dating
Ulleung Island is the top of a volcano that starts at the sea floor. It has been determined, using Radioactive Age Dating, that the volcano last erupted 2990 BC!! Radioactive Dating is a means of measuring the age of material by comparing the amount of radioactive form of an element with the amount of it's decay.
A fault is a break, or crack, in Earth's surface along which movement occurs
Faults
Grand Canyon
Arizona
Mechanical Weathering is a natural process of breaking down rocks and particles
wind
water
ice
heat
Mechanical Weathering
Paleokastritsa Beach
Greece
Sedimentary Rock is rock that forms from compacted sediment
Sedimentary Rock
Bunbury Australia
Igneous Rock is rock that forms when melted rock cools and hardens
Igneous Rock
Kangerlussuaq
Greenland
Metamorphic Rock is rock that forms when existing rock is exposed to high heat, high pressure, or both
Metamorphic Rock
Lochranza
Scotland
An unconformity is contact between two rock units in which the upper unit is usually much younger than the lower unit.
Unconformity
Baranof Island
Alaska
An intrusion is magma from under Earth's surface that cuts through rock layers, cools then solidifies to become igneous rock
Intrusion
Karaginsky Island
Russia
Geological Folding
Folding is the process in which rock layers are squeezed together and pushed upward, forming a ripple in Earth's Crust
Stratigraphy
The study of rock layers
The Law of Superposition
The principle that in undisturbed sedimentary rock layers, older layers of rock lie beneath younger layers.
Uniformitarianism
the theory that changes in the earth's crust during geological history have resulted from the action of continuous and uniform processes.

Ellemere Island
Canada
A cylinder of ice removed from an ice sheet.
Ice Cores
Full transcript