Ever wonder how Earth scientists examine rocks? We cut them up and throw them under a microscope ... and then everything ...

In these, gold occurs in veins alongside quartz and sulfides within the rock. This alteration is shown by the presence of potassium-rich minerals, such as K-feldspar and muscovite, with gold ...

Researchers have dated volcanic layers at six fossil-bearing sites in Turkey, including one known as Taşhan (shown). The ...