After an earthquake which type of seismic wave arrives second at a seismometer

The correct answer is Secondary Waves (S).

Explanation:

When the rocks inside the earth suddenly break, or an exploration occurs, seismic waves are generated.

When an earthquake occurs, the secondary waves (S) are the second to reach a seismometer. This type of waves is known as body waves and they travel through the interior of the Earth instead of moving over the surface.

The waves that arrive first are the Primary (P) waves that are the fastest type of seismic wave, therefore they are the first to reach a seismograph.

the correct answer is amazon river

since there isn't any suggested answers i will give you the reason and hopefully you can figure it

south africa, or rather all of africa, has not been in the location in which it is nowadays throughout the geological past. after the super-continent pangaea started to break apart, gondwanaland, in which was africa, moved further south, and parts of it came to be very close to the south pole. because the climate in this part of the world is very cold due to the very dispersed sun rays in there, what is now south africa, started to freeze, and the conditions were right for the formation of glaciers. the glaciers existed up until the period when gondwanaland started to break apart and what is now africa started to move towards north, sp it warmed up and the glaciers melted.