The buildings in this old mine are made of metal. You can see over 100 years, the silver color of the buildings has changed. The red-brown color is rust. What does this color change tell us about the metal? A) The metal is malleable, so it bends easily. B) The metal reacts in the presence of air and water. C) The dry, desert air has damaged the building over the years. D) The metal is a good conductor of heat and electricity.

(select all the correct choose each statement that is scientific. - the opinions of randomly selected participants in a survey prove the idea that global temperatures are not increasing on earth. - the universe's average temperature and rate of expansion support the idea that it began as one super-dense and hot mass 13.8 billion years ago. - ocean tides are caused by the uneven gravitational pulls of the moon and sun on different parts of earth. - human life is more valuable than other forms of life on earth because humans are more intelligent than other organisms.