The atmosphere exerts a force (pressure) on Earth. Why does the atmosphere exert pressure on Earth? A. because of the pull of Earth’s gravity on air molecules B. because of electromagnetic radiation from outer space C. because of the effect of the ozone layer on solar radiation D. because of the effect of greenhouse gases on heat radiating from Earth

the correct answer is d

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

more words for this could be abiotic and biotic

abiotic: living organisms within an ecosystem

biotic: non-living organisms within an ecosystem