Why can't you snap off a stalactite?

Which layer of the sun gives off heat and light? What are the three pointing devices? What is caused by the pulling of the moon's gravity? What colors and all colors is the the sun? How many gyres are in the northern hemisphere? How did tall boy earn his name in sing down the moon? Why do not you see a rainbow during most rainstorm? What is the lagrest star in the milkway? How do celestial objects move compared to the horizons? What does spacium mean? Galileo found the rotation period of the Sun was approximately? Where do east and west meet? What did buzz Aldrin say when he first stepped on the moon? How is the International Space Station serviced? Who invented the bifocal spectacles? What would be the benefits of being able to grow plants in your space station on the moon or on mars? What is the color of a honeymoon moon? What was the first program to send people to the moon? How have people seen the northern lights in the past? What is a twin tornado?