Stratovolcanoes, or composite volcanoes, mostly erupt dust, ash, and cinders.
The collision of the molecules between the hydrogen molecule or H2, and an iodine molecule or I2, provided there would be a sufficient energy is that the system would eventually undergo a chemical change wherein a new chemical compound would be formed from these two molecules.
No - a precipitation will occur though. Potassium nitrate is soluble in water, so the potassium and nitrate ions will remain spectator ions and stay in solution. Lead (II) hydroxide is not soluble, and will precipitate out of solution to form a solid product.
All of them are important to identify a mineral and get information from it, but I'd say the least important is cleavage.
Answer:
Bacterial cell, cell with a nucleus, multicellular organism
