Question

Geography 2 difference between primary and secondary data

Answer 1

primary data is new and first hand data

secondary data is second hand data which is collected by any old informative data

Answer 2

Primary data:-1Primary seismic waves are the first ones to reach the earth's surface after the emission of energy in the earth's interior.

2:- they travel at a very fast speed.

Secondary data:-1 secondary seismic waves reach the earth's surface after the primary waves.

2:they have a lesser velocity as compared to the primary waves.