D. Some European rivers act as international borders.
That is, Mars appears to move fromwest to east from one night to the next. Every two years or so, there are a couple of months when Mars' position from night to night seems to change direction and move east to west.
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 Scientific Process of Geography. Geography is considered a science and thus also uses the scientific method for data collection, analysis, and interpretation. There is no true definition of the scientific method because it varies so much between scientific disciplines.
