What is sea floor spreading?
Topic 8, Lesson 1 - Evidence of Plate Motions

Flashcard
•
Science
•
6th - 8th Grade
•
Hard
Lisa Burgess
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15 questions
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1.
FLASHCARD QUESTION
Front
Back
Sea floor spreading is the process by which new oceanic crust is formed at mid-ocean ridges as magma rises to the surface and solidifies, causing the continents to move apart.
2.
FLASHCARD QUESTION
Front
What causes the movement of Earth's tectonic plates?
Back
The movement of Earth's tectonic plates is primarily caused by convection currents in the mantle.
3.
FLASHCARD QUESTION
Front
What happens at mid-ocean ridges?
Back
At mid-ocean ridges, tectonic plates move apart, leading to the formation of new oceanic crust through sea floor spreading.
4.
FLASHCARD QUESTION
Front
What are pillow-shaped rocks and how do they form?
Back
Pillow-shaped rocks form when molten material erupts underwater and cools quickly in cold water, creating a distinctive shape.
5.
FLASHCARD QUESTION
Front
What theory replaced Wegener's old theory of sea floor spreading?
Back
The theory of plate tectonics replaced Wegener's old theory, providing a more comprehensive explanation of how continents move.
6.
FLASHCARD QUESTION
Front
Define convection in the context of plate tectonics.
Back
Convection in plate tectonics refers to the movement of molten rock in the mantle that causes tectonic plates to move due to heat from the Earth's core.
7.
FLASHCARD QUESTION
Front
What is subduction?
Back
Subduction is the process where one tectonic plate moves under another and sinks into the mantle, often causing earthquakes and volcanic activity.
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