Salts are compounds that form a crystal lattice. which types of bother responsible for this lattice formation?  A. covalent
B. hydrogen
C. iconic
D. polar

In this synthesis reaction what products will form

What happened in 2012 and how does it illustrate the importance of understanding the sun and how it works?

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.