Why can two igneous rocks have the same minerals but different names?

Where was oil production at its highest in the 1980s and still remains important to the russian economy? central asia the ural mountains russian siberia the caucasus region

The creation of the trans-siberian railway allowed people to travel across russia. how could this railway impact russian culture?

Due to its high humidity, the south often experiences severe storms with heavy rains called cyclones ,hurricanes, monsoons, tornadoes