1. A rock that exhibits a phaneritic texture would be considered an extrusive rock. True False 2. Lahars are caused when which of the following combine? Ash and water Water and dirt Rocks and lava Lava and water Ash and lava 3. Differentiation is a process where _________. All of the answer choices are correct Earth separated into layers or zones of different composition. Oxide and sulfide minerals separated in the Earth's crust Lithospheric plates float on the asthenosphere in terrestrial planets.