Most Commercial airplanes fly in the lower part of this layer:

Explanation
Commercial jet aircraft fly in the lower stratosphere to avoid the turbulence which is common in the troposphere below. The stratosphere is very dry; air there contains little water vapor. 

Explanation
The geographic grid refers to the internationally-recognized system of latitude and longitude used to location positions on Earth's surface.

Explanation
The Earth rotates on its own axis and it rotates in the eastward direction and in a counter-clockwise in prograde motion.

Explanation
Earth is closest to the sun every year in early January , when it's winter for the Northern Hemisphere. Earth is farthest away from the sun in early July, during our Northern Hemisphere summer.

Explanation
Scotsman John Dunlop developed the first practical pneumatic tire in 1888 .

Explanation
Max Karl Ernst Ludwig Planck, was a German theoretical physicist whose discovery of energy quanta won him the Nobel Prize in Physics in 1918 .

Explanation
Quebec is a province of Canada.

Explanation
Qatar is located in west Asia. قطر مغربی ایشیا کا ایک اہم ملک ہے۔

Explanation
Seven Mile Beach is a long crescent of coral-sand beach on the western end of Grand Cayman island. 

Explanation
Falchion is a  broad, slightly curved sword with the cutting edge on the convex side.