I believe the answer to your first one is D) Sorghum
To your second question it is A) Rwanda
Hey there!!
Scientists are able to understand Earth's interior by studying seismic waves<span>. These are waves of energy that travel through Earth, and they move similarly to other types of waves, like sound waves, light waves, and water waves.</span>
Hope this helped and have a great day (:
Basically you need to ask: how long are the seasons? The seasons rotate on a yearly basis, which corresponds to the Earth's rotation around the Sun - so the major cooccurence is the Earth's rotation around the Sun, combined with the change in the tilt of the Earth's axis.
This in turn influences the currents and the precipitation, which more directly cause the change of the seasons.
It is said to be found at the South American plate.