What is the scale of the map? For this activity, you will use centimeters.
1 cm = 405 km
Choose one strip of seafloor rock. What is the age of the rock?
20
Use your ruler to measure the distance of the strip from the Mid-Atlantic Ridge.
3 cm
Using the calculator, multiply the answer to #4 by 405 to figure out its distance in kilometers. Round to the nearest whole number.
i multiply 3 by 405 and get 1215 km
Determining Rate of Spreading
Use the age of the rock you have chosen and its distance from the Mid-Atlantic Ridge to calculate seafloor spreading.
First you will find out how fast the seafloor is moving away from the ridge on one side. Use a calculator to divide the answer to #5 by the answer to #3. Round to the nearest whole number.
#5 km ÷ #3 million years = km/million years
![What is the scale of the map For this activity you will use centimeters 1 cm 405 km Choose one strip of seafloor rock What is the age of the rock 20 Use your ru class=](https://us-static.z-dn.net/files/d11/276186a5c598e11d07cf903e253c3712.png)