Which of these would remove water from a river?
River water sweeping into the soil
Snow in the mountains above the river melting
A stream flowing into the river
Rain falling in the area near the river

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

layer 3 is younger than layer 6.