A group of geography students decided to collect information about the gradient (slope) of a local beach as part of a survey about beaches. After taking two measurements at either end of the beach
(east and west) they developed the following conclusion
The beach profile is steeper at the eastern section compared to the west section
18 Explain why the reliabidity of their conclusion may be poor
[2 marks]

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.

ask an adult bc this is too hardcore