ACTIVITY 2.5 Atlantic Seafloor Spreading Name: A·The map below shows the agesofs

Question

ACTIVITY 2.5 Atlantic Seafloor Spreading Name: A·The map below shows the agesofseafloor basalt (the actual flor of the ocean beneath the Course/Section North America and Africa. Date: modern mud and sandi between 1. Draw a red line on the map to show the exact location of the divergent plase boundary berween the and the African and Eurasian Plates. Refer to FIGURE 2.5 for assistance as needed 2. Draw two blue lin North American Plate FIGURE 2.2 for assistance as needed es on the map to show the exact position of two different transform faalt plate boundarics. Referto Holocene & North Piocene Mocene Eocene, & 5.3 Spain e D #8 Atrica Jurassic B. Notice dat pens Bad togecther 145million years ago, bur did the sca floor specad sgurt at cesactly the same rate on both sides of the md-oan rivige? Hoe can you tell C. How far apart are poinss B and Ctoday, in kilometerekm 1. Calculate the average rate, in km per million years that points B and C have moved apart over the past 145 million years. Show your work 2. Convert your answer above from km per million years to mm per year. D. REFLECT& DISCUSS Based on your answer in Cl above, how many millions of years ago and in what geologic period of time were Afria and North America part of the same continent? Show your wock. REFLECT&DISCUSS Based on your answer in C2 above, how far in meters have Africa and North America E. moved apart since the United States was formed in 1776 63

Explanation / Answer

According to scale 2.5cm=2000km

On the left hand side the distance is 4.4cm so 3520km.

On right hand side the distance is 3.6cm so 2880km.

So the average distance on both the sides is (2880+3520)/2=3200km

This much distance the plate have moved over a period of 145MY.

So the rate of spreading will be 3200/145=22.0689km/My

=0.0000220689km/yr (1my=1000000yr)

= 0.0220689m/yr (1km=1000m)

= 22.0689mm/yr (1m=1000mm)

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