The Earth's magnetic field is approximately 0.5 Gauss. What is the magnetic energy density of this field

The  magnetic energy density  is  

Explanation:

From the question we are told that  

    The  earths magnetic field is  

Now

=>        

So  

Generally the magnetic energy density is  mathematically represented as

  Here is the  permeability of  free space with a constant value

substituting values for equation above  

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.

conservation of mass

mass before something happens = mass afterwards