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Paleomagnetism and the Ocean Floor
Transcript of Paleomagnetism and the Ocean Floor
How may kilometers has the left side of the Pacific basin spread in 2 million years?
How many kilometers have the left side of the North Atlantic basin spread in 2 million years?
Pacific Ocean rate = 8 cm/yr
How many kilometers has each ocean basin opened in the past 2 million years?
ANALYZE AND CONCLUDE
Do ocean basins spread uniformly over the entire basin? Explain.
Record the number of times Earth's magnetic field has had reversed polarity in the last 4 million years
- 5 (five)
Determine which ocean basin has spread the greatest distance during the last 2 million years
- the ocean basin of Pacific Ocean has spread the greatest distance uring the last 2 million years
- 80 km
35 mm/40km = 70 mm/x
35 mm x = 2800 mm km
x = 2800 mm km/35 mm
x = 80 km
- 38.9 km
35 mm/40mm = 34 mm/x
35 mmx = 1360 mm km
x = 38.9 km
Pacific Ocean = 160 km
South Atlantic Ocean = 78 km
North Atlantic Ocean = 77.8 km
If both the distance that each ocean basin has opened and the time it took to open that distance are known, the rate of seafloor spreading can be calculated. Determine the rate of seafloor spreading for the South Atlantic Ocean basin in centimeters per year.
- 3.9 cm
distance = 7 800 000 cm
rate = 7 800 000 cm / 2 million yr
= 3.9 cm/yr
Determine the rate of seafloor spreading for the North Atlantic and Pacific Ocean basins.
North Atlantic Rate = 3.89 cm/yr
distance = 7 780 000cm
rate = 7 780 000/ 2 000 000 yr
= 3.89 cm/yr
distance = 16 000 000 cm
rate = 16 000 000/2 000 000 yr
= 8 cm/yr
Which ocean basin is spreading the fastest? The slowest?
- Pacific ocean basin spread the fastest while North Atlantic ocean basin spread the slowest
- yes, because of paleomagnetism