The crust is made of solid rocks and minerals. Beneath the crust is the mantle, which is also mostly solid rocks and minerals, but punctuated by malleable areas of semi-solid magma. At the center of the Earth is a hot, dense metal core.
<h3><em>Crust is the outermost shell of a terrestrial planet</em><em>.</em></h3><h3><em>Mantle is the mostly-solid bulk of Earth's interior. </em></h3><h3><em>Core is the most inner part if the Earth. It is made of two layers: the outer core, which borders the mantle, and the inner core. </em></h3>
The combustion of fossil fuels such as coal and oil has raised the concentration of carbon dioxide in the atmosphere during the last century (CO2). This occurs because the combustion of coal or oil produces CO2 by combining carbon in the air with oxygen.
