Monday I am a structure that protects objects inside of me. I am always used for support, and am sometimes...

Monday
I am a structure that protects objects inside of me. I am always used for support, and am sometimes made of cartilage. Calcium is important to my growth. What am I?
Tuesday
Fill in the puzzle, using the names of states (in the U.S.A.) in which volcanoes are located.
Wednesday
What chemical compound covers over two thirds of the Earth's surface?
Thursday
Unscramble each word. Which words name methods of pollination?
tarew citsens diwn risdb usn
Friday
I can be three different states of matter, but not at the same time. I am necessary for life, but I can also destroy life. I can be under your feet, around your body, or over your head. What am I?