For hundreds of years, geologists and atmospheric scientists have worked to understand the composition of rocks and gases on Earth.
(geologists and atmospheric scientists; have worked; to understand the composition of rocks and gases on Earth; T:For hundreds of years) Context(geologists and atmospheric scientists have worked,List([23, 72))):(geologists and atmospheric scientists; have worked to understand; the composition of rocks and gases on Earth)
geologists and atmospheric scientists have worked,List([23, 72))
geologists and atmospheric scientists geologists and atmospheric scientists
have worked have worked to understand
to understand the composition of rocks and gases on Earth T:For hundreds of years
the composition of rocks and gases on Earth