The distance in kilometers of anomaly known (distance) divided by age of anomaly.
sea-floor spreading
rate of spreading for stripe = width of stripe / time duration If a magnetic strips is 60 km wide and formed over 2 million years, then the rate at which spreading formed the was 30 km/m.y. The rate is equivalent to 3 cm/year. Spreading added an equal width of oceanic crust to a plate on the other side of the mid-ocean ridge, so the total rate of spreading across the ridge was 60 km/m.y. (6 cm/year), a typical rate of seafloor spreading.
10cmy
Typical rates of spreading average around 5 centimeter (2 inches) per year.
It ranges from 2 to around 11 cm per year.
sea-floor spreading
sea-floor spreading
rate of spreading for stripe = width of stripe / time duration If a magnetic strips is 60 km wide and formed over 2 million years, then the rate at which spreading formed the was 30 km/m.y. The rate is equivalent to 3 cm/year. Spreading added an equal width of oceanic crust to a plate on the other side of the mid-ocean ridge, so the total rate of spreading across the ridge was 60 km/m.y. (6 cm/year), a typical rate of seafloor spreading.
Multiply the hourly rate by 1.5
5 years
Basically two steps. First, you calculate how much volume half the tank would have. Then you simply divide this volume by the rate.
100-200 mm
Neither is spreading faster. They are both spreading at the same rate.
There are three processes that add material to the ocean floor: Sedimentation, and Vulcanism. Sedimentation is usually caused by skeletons of sea animals falling to the ocean floor. It can be argued that this is not new material but only recycled materials. But some of the remains are calcium or other deposits that are added from land based run off. Silt deposits also run into the ocean floor from the land, Vulcanism results from shifts in the ocean mantle with new material coming from deeper in the earth and spouting through volcanoes or emerging as new ocean floor at the rising edges of the tectonic plates.
Check the time between your first decay rate and when the decay rate reaches half this number. Half life T1/2 is calculated using the below formula T1/2=0.6931/r Where r is disintegration constant
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