The sextant, a practical tool for celestial (sky) navigation, was in common use. The chronometer (an accurate clock) had been invented but had not yet become widely used. ... An angle-measuring instrument called a sextant, to measure the angle of the stars above the horizon.
The Amazon is much larger than the Mississippi and are located on different continents.
The Amazon flows through ( I think ) more jungle and rainforests where the Mississippi isn't located in land like that. ( there's literally a highway that follows it down )
Its called the Photosphere, which is the part that we can see.
There are 165 major rivers in the world .
Answer: it is A
Explanation: best explanation.
