Geo 225 notes

The margins of our continents were added by collision with younger and smaller segments of continents and ocean crust that mostly migrated from the south. We will refer to the conventional bearing simply as the direction.

What drives the motion of plates? How does plate tectonics help us to understand the geologic history and evolution of North America? The central "core" of North America "assembled" about 1, m.

Arabia rifts away from Africa. Was the last phase Geo 225 notes continental rifting unique in Earth history? Note that the oldest oceanic crust is only about m. Map of the sea-floor -- oldest crust is about m. Which way seems to be the most important at least for the Pacific plate? Continuous creation of oceanic crust during magnetic reversals.

A bearing is used to represent the direction of one point relative to another point. Direction The conventional bearing of a point is stated as the number of degrees east or west of the north-south line. Convection occurs because of unveven distribution of heat sources in the mantle.

A lesser source is "fossil heat," the heat energy trapped in the Earth during its formation. Identify and describe briefly the different kinds of ways that convection currents can interact with plates to make the plates move.

India continues to move north. What are the sources of internal heat in the mantle? Mark the angle in a clockwise direction by indicating the turn between the north line and the line joining the centre of the compass to the point P.

Is it still going on? Plates largely surrounded by trenches e. G and L have separated.

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Those variations, which they termed "magnetic anomalies" were symmetrical on either side of mid-ocean ridges and parallel to the ridges: South Atlantic continues to open. So, some parts of the deep mantle must be more radioactive than other parts.Buy a Geo Storm Radiator at discount prices.

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Exam Notes Geography 225

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Geo 225 notes
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