What textures are possible in extrusive rocks?
Regional SpecificsExtrusive igneous rocks will have aphanitic, vesicular, glassy, or pyroclastic textures. What is the texture of extrusive rocks? Extrusive igneous rocks have a fine-grained or aphanitic texture, in which the grains are too small to see with the unaided eye. The fine-grained texture indicates the quickly cooling lava did not have time to grow large
What are P waves and S waves also called?
Regional SpecificsP-waves and S-waves are sometimes collectively called body waves. What type of waves are P and S waves? Types of Waves: Mechanical Body Waves: P and S waves are mechanical body waves. A mechanical wave is a wave that must travel through a medium, such as the ground or air. The energy of a mechanical
What is the crystal structure of feldspar?
Regional SpecificsStructure. The structure of a feldspar crystal is based on aluminosilicate tetrahedra. Each tetrahedron consists of an aluminium or silicon ion surrounded by four oxygen ions. Each oxygen ion, in turn, is shared by a neighbouring tetrahedron to form a three-dimensional network. What is the crystal of feldspar? Most feldspar crystals are tabular and flattened
Where exactly is the San Andreas fault line?
Regional SpecificsSan Andreas Fault, major fracture of the Earth’s crust in extreme western North America. The fault trends northwestward for more than 800 miles (1,300 km) from the northern end of the Gulf of California through western California, U.S., passing seaward into the Pacific Ocean in the vicinity of San Francisco. Where does the San Andreas
What is converging tectonic plates?
Regional SpecificsConvergent (Colliding): This occurs when plates move towards each other and collide. When a continental plate meets an oceanic plate, the thinner, denser, and more flexible oceanic plate sinks beneath the thicker, more rigid continental plate. This is called subduction. What does converging tectonic plates produce? The impact of the colliding plates can cause the
What is viscosity in volcanoes?
Regional SpecificsViscosity is the resistance to the flow of a substance. Viscosity is directly related to the amount of silica content. The more viscous the magma the more explosive the volcanic eruption will happen. What is the viscosity of the lava? Thus, basaltic magmas tend to be fairly fluid (low viscosity), but their viscosity is still