What are the weaknesses of calcium?

Is burning sugar a physical change? How high is the window above the ground if a ball drops and strikes the ground 2.00 seconds later? Where does the suns rays hit the tropic of cancer and tropic of Capricorn? Where can one purchase Sugared Pecans? What is the atomic mass of granite? What are sedimentary structures and why are they so important? How does the sun move along the ecliptic among the stars? What is the analogy for latitude horizontal and longitude? How do rocks on earths surface sink to the crust? How does the composition of magma affect the temperature at which a solidifies? Who was credited with developing the branch of biology now called genetics? What is the fracters of 100? Why water comes out slowly from an upstairs tap than a similar tap placed downstairs? Do platelets dissolve a forming clot? Is a cave a living thing? What does the slime capsule do? Is The geologic time scale divided by major changes in the fossil record true? ATP contains a large amount of energy because? How can a massive steel ship float on water? What conditions do you see single stranded DNA?