Rocking with rocks!
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Rocking with rocks!Table of Contents #7What are igneous, sedimentary, and metamorphic rocks and which picture is a representation of that rock type.
ABCTypes of rock Igneous - think of the word ignites Formed from solidified molten rocks
Metamorphic Think of the word magmaFormed when other rocks are changed by heat, pressure, and chemical reactions within the Earth
Sedimentary - Formed when combinations of rock fragments, seashells, and chemicals are composed in layers and hardens Something to think aboutOut of the three types of rocks, which one do you think will have fossils? Explain which rock type you chose and why the others wouldnt have any.
The Earths Story Uniformitarianism
Theory: Geologic change is gradual
To help me remember:
think of uniform Catasrophism
Theory: Geologic change is sudden
To help me remember:
Think of catastrophe (disaster) Hutton known as the father of GeologyLyell went against Uniformitarianism and believed the present is the key to the future5Current theoryModern geology (current theory): Gradual geologic change is interrupted by catastrophes
To study geologic change involves studying past life. Using fossils to study past life is called paleontology.Relative datingRelative Dating: what scientist use to determine whether an event or object is older or younger than another event or object
Relative Dating is just an ESTIMATE of events There is no absolute information
Until about the 1900s geologists didnt have a way of determining the absolute age of objects. So instead they used the relative age and clues to give them a better idea of things7Law of Superposition The Law of Superposition states:Younger rock lies above older rock in an undisturbed sequence.
The answer to the pervious question is Sedimentary Rock. The bottom layer of rock forms first, which means it is the oldest. The layer above that is younger and the layers become younger and younger as the layers lay on top. 8
Which layer is the the oldest
9Geologic Column Geologic column is an arrangement of rock layers in which the older rocks are at the bottomGeologic columns help scientist find the relative age of the Earth.So what about disturbed rock?Features:Faults break in the Earths crust, where blocks of crust shift past one another
FeaturesIntrusion Igneous rock (molted rock) from the Earths interior that squeezes into existing rock and cools (younger then sedimentary layers)
EventsFolding Occurs when rock layers bend and buckle from Earths internal forces
EventsTilting -occurs when Earths forces move rock layers until they become slanted.
Cross cutting lawAny feature that cuts across a body of sediment or rock is younger than the body of sediment or rock that it cuts
LIST THE LAYERS FROM YOUNGEST TO OLDEST
ABCDEFGAnswer D, B, E, G, A, F, C 16LIST THE LAYERS FROM YOUNGEST TO OLDEST
Answer E, D, A, B, C17Recap: Is the rock in this picture disturbed? If so, explain how.
How about now?