What causes seismic activity, volcanism, and mountain uplift?

What causes seismic activity, volcanism, and mountain uplift?

• A. Gravitational pull of the Moon
• B. Ocean currents
• C. Wind patterns
• D. The Earth's lithospheric plates move

Answer: (D)

Seismic activity, volcanism, and mountain uplift come from the movement of the Earth's lithospheric plates. The outer shell of the Earth is made of large, rigid plates that float on the semi‑melted rock beneath. These plates are always slowly moving because of convection in the mantle beneath them. When they meet, slide past, or pull apart, they cause the dramatic geologic phenomena we observe. At convergent boundaries, plates collide and crumple, lifting rock to form mountains, and one plate may sink beneath another and melt to create magma that feeds volcanoes. At divergent boundaries, plates move apart and magma rises to generate new crust and volcanic activity along ridges. Transform boundaries involve two plates sliding past each other, releasing energy as earthquakes. So the driving force behind earthquakes, volcanoes, and mountain building is the motion of these lithospheric plates. The Moon’s gravity, ocean currents, and wind patterns influence tides, climate, and weather, but they don’t push the deep, slow motions of plate tectonics that cause these geologic events.

Seismic activity, volcanism, and mountain uplift come from the movement of the Earth's lithospheric plates. The outer shell of the Earth is made of large, rigid plates that float on the semi‑melted rock beneath. These plates are always slowly moving because of convection in the mantle beneath them. When they meet, slide past, or pull apart, they cause the dramatic geologic phenomena we observe. At convergent boundaries, plates collide and crumple, lifting rock to form mountains, and one plate may sink beneath another and melt to create magma that feeds volcanoes. At divergent boundaries, plates move apart and magma rises to generate new crust and volcanic activity along ridges. Transform boundaries involve two plates sliding past each other, releasing energy as earthquakes. So the driving force behind earthquakes, volcanoes, and mountain building is the motion of these lithospheric plates. The Moon’s gravity, ocean currents, and wind patterns influence tides, climate, and weather, but they don’t push the deep, slow motions of plate tectonics that cause these geologic events.