C.energy
The law of conservation of energy says that energy can neither be created nor destroyed.
A. All natural radiation is at a level low enough to be safe
All matter is made of particles; these can be single atoms or atoms chemically joined to make molecules. Using this fact, matter can be classified into three broad groups: elements, compounds and mixtures. In an element, all the atoms are of the same type. If more than one type of atom is chemically joined, then a compound has been formed. If more than one type of atom or molecule is contained in the same substance, and the particles aren't chemically joined, this is a mixture.
Answer:
it b
Explanation:
bc A water droplet falling in the atmosphere is spherical