Crust (geology) only planet in our Solar System with plate tectonics. The crust is a thin shell on the outside of the Earth, accounting for less than 1% of Earth's volume. It is the top component of lithosphere: a division of Earth's layers that includes the crust and the upper part of the mantle. The lithosphere is broken into tectonic plates that move, allowing heat to escape from the interior of the Earth into space. The crust lies on top of the mantle, a configuration that is stable because the upper mantle is made of peridotite and so is significantly denser than
Ruby (given name) Ruby (given name) Ruby is a predominantly feminine given name taken from the name of the gemstone ruby. The name of the gemstone comes from the Latin "ruber", meaning "red". The ruby is the birthstone for the month of July. The name first came into wide use for girls in the late Victorian era along with other jewel names. Ruby is a currently popular name in English-speaking countries. It was the second most popular name given to baby girls in England and Wales in 2009, was the 24th most popular name given to baby girls born in Scotland in 2009;