What are hollow spaces in the Earth's crust called?

Is earths revolution close to 1 degree per day? What chromosomes did the father contribute if a normal female is produced? What effect will decreasing the H plus of a solution have on pH? What happens when pressure is put on sides of a plate? What is the relationship between affluence and ecological footprint? Why doesn't phenol react with carbonates? What is the total potential and kinetic energy of all microscopic particles in an object? When did Oso Complex Fire happen? A large open area of grassland typically in North America? In the last ten years we have made more plastic than in the? What is urine for cytology? When was Mount St. Helens' most powerful eruption? How many bars in the introduction of the song titanium? How do you calculate the boiling point of water-ethylene glycol mixture? Are typically the smallest of the host bases organizations and report directly to the wind commander? What are purimidines? What compound is 2nacl br2? What is the clear elastic protein layer around the cell membrane of ciliates like the paramecium? What is the moving of broken down rocks and sediments from one place to another called? Which electron has the highest energy n equals 1 shell n equals 2 shell n equals 100 shell or the n equals 0 shell?