Magma erupting to the surface is called (a) ___. Since this mass cools rapidly, the crystals are (b) ___ in size and the rock's texture is (c) ___. Clastic sedimentary rock type is defined by ___. What is a branch of geology that ...
in the magma become magnetized in the direction of the geomagnetic field. As the magma cools and hardens into rock, the direction and the polarity of the geometric field are recorded in the magnetized (45) volcanic rock. Thus, when reversals of the earth’s ...