Earth
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What do echo sounders produce?
Echo sounders produce sound waves that travel outward in all directions, bounce off the nearest object, and then return to the ship
List 1 out of the 4 reasons wageners hypothesis was right?
• mountain ranges • Fossils • puzzle pieces • Magnetic Polarity Evidence
Is the ocean completely flat?
No it is not completely flat.
What is normal polarity?
When north and south poles are aligned as they are now.
What is reversed polarity?
When north and south poles are in the opposite position.
Where is the oldest sea floor located?
The oldest seafloor is near the edges of continents or deep sea trenches and is less than 180 million years old.
How is new sea floor formed?
By hot magma at the ridge that erupts as lava
Define Bathymetry
Study of underwater depth
What are plates made up of?
The plates are made up of the lithosphere
Define plate boundaries
Plate boundaries are the edges where two plates meet