What is the difference between sunlit zones and trenches

Which of the following is not a place where hydrogen can be found on earth? a. natural gas well b. atmosphere c. water d. mine

Witch of the following volcano hazards is made up of rocky particles about the size of a grain of sand

Mosses, lichens and shrubs can be found where in russia? a. grasslands b. mountain regions c. coastal plains d. siberian tundra