Question

who envent first phone and when​

Answer 1

If you see that the contours lines are

meeting each other, what kind of landform

will it be?If you see that the contours lines are

meeting each other, what kind of landform

will it be?Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.