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chapter 3 science
Terms in this set (32)
A super continent containing all of Earth's land that existed about 225 million years ago.
Wegener inferred that these ancient reptiles once lived on a single landmass that has since split apart
Mesosaurus and Lystrosaurus
What evidence did Wegener use to support his hypothesis?
Evidence from land features, fossils, and climate
Which hypothesis states that the continents slowly moved to their present-day position on Earth?
Most geologists of Wegner's time ___ his hypothesis of continental drift.
fossil plant that helps support Wegener's the theory of continental drift
The hypothesis that the continents slowly move across Earth's surface. Proposed by Alfred Wegener
The coast lines and mountain ranges of Africa and South America
As a continent moves __ the poles, its climate gets colder
As a continent moves __ the equator, its climate gets
An underwater mountain chain where new ocean floor is formed. Also the longest mountain chains on Earth.
a valley in the ocean created when one plate subducts under another
The process by which molten material adds new oceanic crust to the ocean floor
processes that change the size and shape of the oceans.
Subduction and sea floor spreading
the device that scientists use to map the ocean floor.
a deep ocean trench is an underwater ________
________material erupts inside the central valley of mid ocean ridges.
the farther from a mid ocean ride a rock sample is taken the ____ the rock is.
underwater mountain ranges where seafloor spreading occurs.
the pattern of magnetic stripes in rocks on either side of a mid ocean ridge is _________________
What is the area called where plates meet?
What is a fault and where does it occur?
Faults are breaks in the Earth's crust where rocks have slipped past each other.Occurs in fractures of the earth's crust.
What are the three types of plate boundaries?
divergent, convergent, transform
What does the divergent boundary do?
Plates move apart or diverge from each other at divergent boundaries
What does the convergent boundary do?
Plates move together or converge at a convergent boundary.
What does the transform boundary do?
Plates slip past each other along a transform boundary.
What is a rift valley and where does it occur?
A deep valley that forms where two plates move apart Rift valleys are found both on land and at the bottom of the ocean, where they are created by the process of seafloor spreading
What force drives plate tectonics?
What is the plate tectonics theory?
The theory of plate tectonics states that Earth's plates are in slow, constant motion, driven by convection currents in the mantle.
How do the plates move?
Slowly and constantly
The San Andreas fault is what type of plate boundary?
What type of plate boundary creates mountain ranges?
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