Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
24 Cards in this Set
- Front
- Back
Geologic Time Scale
|
Both relative (what happened in what order) and absolute (actual number of years before the present) methods are used in determining the sequence of the time scale.
|
|
When geologists or acheologists dig downward into a rock or sediment they are digging "back in time." This fact is based on what principle?
|
superpostion
|
|
Uniformitarianism
|
physical processes operating at the same pace and intensity thats characterized throughout geologic time (Hutton and Lyell)
|
|
Through the atmosphere, crust and mantle the ROCK CYCLE produces what three rocks?
|
1. Igneous
2. Sedimentary 3. metamorphic |
|
The majority of Earths crust is composed of what rock?
|
Igneous Rocks make up 90% of the Earths crust, although they are completely covered by sedimentary rocks (sandstone,shale,limestone), soil or oceans.
|
|
Conintental Crust is basically _____, when oceanic crust is basically _________.
|
granite;basalt
|
|
Three types of rock forming processes form the_____
|
rock cycle
|
|
My example of an intrusive igneous rock is:
|
Pluton: which cools slowly in the crust
|
|
The ancient roots of mountains are usually composed of what rocks?
|
metamorphic
|
|
The occurence of "contact" metamorphism would be direct evidence of :
|
the local intrusion of magma that "cooked" adjoining the rock
|
|
whats located along mid ocean ridges?
|
volcanoes
|
|
The deepest single group of features on the Earths crust are:
|
the areas of plate subduction along the ocean.
|
|
What location does subduction occur?
|
along collision zones between continental and oceanic plate
|
|
convergent plate boundaries are characteristics of:
|
collision zones between plates
|
|
Of all the major plates, India:
|
accelerated over 70million years ago on its northward drift.
|
|
Transform faults along plate boundaries are characteristics of:
|
lateral motions of plate
|
|
Transform faults occur:
|
between the crests of the spreading centers, where ocean floor is moving in opposite directions
|
|
Convection
|
transfer of heat energy from one place to another (verticle motion)
advection (horizontal motion) |
|
Sea floor spreading center that lead to the formation of the atlantic ocean accelerated dramatically between....
|
135 and 65 million years ago
|
|
Earthquake epicenters are located with what three patterned locations?
|
divergent,convergent, transform boundaries
|
|
Volcanic activity can form:
|
a. around the Pacific Ocean Basin
b. along sea floor speading, mid ocean ridges c.at or near hot spots around the mantle plumes |
|
Orogenesis
|
mountain building and thickening of the crust
|
|
As tensional stress cracks the brittle crust:
|
a series of parallel faults form downward-faulting blocs into the rifting crust
|
|
What does "Plume" refer to?
|
a narrow column of unusually hot mantle material that flows convectively from great depths to the Earths crust
|