11. Why are there high and low tides on Earth? A. They are due to changes in the moon's tilt on its axis.
B. They are due to the gravitational pull between Earth and the moon.
C. They are due to the magnetic force between Earth and the moon.
D. They are due to changes in the moon's speed every month.

Chemist Fritz Haber and engineer Carl Bosch discovered a way to make ammonia efficiently.  

They actually discovered a process that is Haber-Bosch process that is a process of nitrogen fixation that provides manufacturing of ammonia industially. Haber-Bosch process is an artificial process of nitrogen fixation. That is a process of manufacturing ammonia industially.