Niger and Congo are two rivers after which countries are named (actually in both cases two countries each) - and those are African countries, so they must be in Africa.
Zambezi is a river in Angola and Namibia.
Tigris is a River in Mesopotamia, in Asia - so that's the correct answer!
The reason why the large-scale convection currents occur in the atmosphere is because Earth's rotation causes air at the equator to move much faster than air at the poles.
<h3>What is convection?</h3>
This can be defined to mean the circular motion that air is made to pass through.
This causes warmer air with faster molecules to be dense as the cooler air gets to the atmosphere.
Read more on convection here:
brainly.com/question/9382711
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Disconformities, nonconformities and angular unconformities
The landform that is much of northern and eastern Europe would be plains.
For number 2 I would say C because take a square for example which is a quadrilateral has all 90 degree interior angles so does a rectangle. As for number 3 I would say maybe A or B I’m a bit confused to as what the question is asking. Hope this helped a bit though and good luck!