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15 Cards in this Set

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Principle of uniformitarianism
the geologic processes we see in action today have worked in much the same way throughout geological time.
bolide
large meteroid that impacts earth.
differentiation
the transformation of rando chunkc of primordial matter into a body whose interior is divided into concentric layers that differ from one another both physically and chemically. Differentiation occured early in Earth's history, when the planet got hot enough to melt.
When did the big bang take place?
app. 13 billion years ago
Under intense pressure and high temperature, hydrogen atoms combine to for Helium. This process is called_________.
nuclear fusion
what caused dust and condensing material to accrete into planetesimals?
gravitational attraction and collisions.
What are the four inner planets like?
small, rocky, and relativley lacking in volitile elements.
Of what are the giant outer planets composed?
hydrogen and helium
what is the process by which an originally homogenous Earth developed a dense core and a light crust?
metamorphism.
90% of the Earth is made up of which 4 elements?
iron,oxygen, silicon, magnesium
the earth's lithosphere is ______km thick?
100 km
the athenosphere is. . .
hot and weak
what are the "plates" of plate tectonics made up of?
lithosphere
weather
describes the temperature, precipitation, cloud cover, and winds obsered at a point on Earth's surface.
climate
description of weather cycles obtained by averaging temperature and other variables over many years of observation.