Catastrophic events are sudden, natural or man-made, situations where change & destruction occur. All catastrophic events are the Earth's way of maintaining equilibrium during change.
Answer:
Covalent Bond
Explanation:
Covalent Bonds happen when elements in a compound share electrons to exist together in a stable state as in the diagram
Answer:
Magnetic field will be equal to 
Explanation:
We have given velocity of proton 
Magnetic force experienced by proton 
Charge on proton 
Angle between field and velocity 
Force in magnetic field is equal to 
So 

So magnetic field will be equal to 