A) 21st century B) 19th century C) 17th century D) 15th century
A) French Revolution B) Scientific Revolution C) Industrial Revolution D) American Revolution
A) Helium B) Carbon dioxide C) Oxygen D) Nitrogen
A) Preventing greenhouse gas emissions B) Absorbing heat and carbon dioxide C) Releasing heat into the atmosphere D) Causing cooling of the Earth
A) Sahara desert B) Amazon rainforest C) Arctic D) Antarctica
A) Nitrous oxide B) Carbon monoxide C) Sulfur dioxide D) Methane
A) Miocene B) Anthropocene C) Pleistocene D) Holocene
A) Solar radiation B) Volcanic eruptions C) Human activities D) Plate tectonics |