Lake Titicaca
Because the air pressure drops the higher you go. If the cabin wasn't pressurised to ground level - all the passengers (and crew) would eventually suffocate !
Albert Einstein and his professor had a disagreement about the existence of God. Einstein believed in a higher power that created the universe, while his professor argued that there was no scientific evidence to support the existence of God. Their argument centered around the philosophical and scientific implications of the concept of a higher power.
Passenger airplanes usually fly around 30,000-38,000 feet. Small aircrafts fly lower and military aircrafts can fly higher.
The altitude needed to see the curvature of the Earth is typically around 35,000 feet or higher, which is the cruising altitude of commercial airplanes.
about 600mph at about 70,000 feet and 1,200mph at higher heights.
abraham lincoln
There are many types of teachers in a higher education and collegiate setting. They can range from adjunct professor to Andelot meaning the professor in charge of the department.
In order to see the Earth's curvature, you would need to be at an altitude of around 35,000 feet or higher, which is typically the cruising altitude of commercial airplanes.
A professor is higher in rank than a doctor; it would be more appropriate to address them as professor if they hold the title.
No, you do not need a PhD to become a professor, but it is typically required for most positions in higher education.
In most cases, you need a higher degree, like a master's or a Ph.D., to become a professor.
It is possible to become a professor with just a bachelor's degree, but it is uncommon. Most universities require a higher degree, such as a master's or a Ph.D., for professor positions.