A boat can cover 120 km in upstream in 6 hours and 180

Identify the gas that is not considered a permanent part of the Earth's atmosphere.

Which moon is the smallest in the solar system? 

RHEA and TETHYS are names of which celestial bodies

Who was the third astronaut to travel to the Moon alongside Neil Armstrong and Buzz Aldrin? 

Consider the following statements about Project Kuiper: 

1.    Amazon recently signed an agreement with NASA to support this Project.

How long does it take for sunlight to travel from the Sun to Earth? 

What is the term for the Moon's orbit around the Earth with respect to the stars? 

Myria, the world’s largest aircraft has been destroyed by which of the following countries?

Which one of the following is responsible for nuclear fission?

The number of ______ is equal to the difference between the mass number of the atom and the atomic number.