Look at the map of the united states. which of the following would be a reasonable estimate for the amount of the u. s. coastline that is in the "severely eroding" category?

*remember, these are estimates and should fall within an acceptable range.

a. less than 5%

b. 10-20%

c. 70-85%

Option B , 10-20%

Explanation:

If we look at the map we could see that majority of the coastal area of the United States is moderately eroding. This color is denoted by orange. Hence, one thing is sure that moderately eroding coastline comprises of more than 50% of the total coast line.  

Hence, option C cannot be correct.  

Now if we just look at the red colored coast line we could see that a considerable length of red coast can be seen which is any case is definitely more than 5%. Hence, the only option left is option B.  

there are no correct statementd on the list of choices you provided.

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.