Earth’s inner core is
a. a dense ball of solid metal.
b. a layer of molten metal.
c. a layer of hot rock.
d. a layer of rock that forms earth’s outer skin.

The correct answer is - a. a dense ball of solid metal.

Earth's inner core is the layer of the Earth that is the most dense, has the biggest mass, and is the one that mostly creates the gravitational pull of our planet. It is thought to be consisted of metal, solid one, but under enormous pressure and temperature. The metal that dominates in here is the iron, and it is accompanied by nikel. The inner core is essential for the life on Earth as it affects everything that happens on its surface. It is getting weaker over time, and once it is in function anymore the life on Earth with vanish, luckily this will be in the far future.

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.

the correct answer would be true friction causes the faults to slip or collide