How many elements make up 98% of the earths crust

Which of the following energy sources is not an example of renewable energy? a. a wind turbine farm b. a clean-burning, coal-fired electric plant c. a hydroelectric dam d. a solar panel mounted on a home

The earth is composed of three different chemical layers: core, mantle and crust. the formation of these layers was from a process called

Which country in the video has the highest population growth rate?