GEOLOGY

Detailed explanation-1: -The theory of plate tectonics (tek TAHN iks) states that pieces of Earth’s lithosphere are in slow, constant motion, driven by convection currents in the mantle.

Detailed explanation-2: -plate tectonics – the theory that pieces of Earth’s lithosphere are in constant motion, driven by convection currents in the mantle.

Detailed explanation-3: -The system of ideas behind plate tectonics theory suggests that Earth’s outer shell (lithosphere) is divided into several plates that glide over the Earth’s rocky inner layer above the soft core (mantle).

Detailed explanation-4: -Convection currents drive the movement of Earth’s rigid tectonic plates in the planet’s fluid molten mantle. In places where convection currents rise up towards the crust’s surface, tectonic plates move away from each other in a process known as seafloor spreading (Fig.

Detailed explanation-5: -The plates move on a hot flowing mantle layer called the asthenosphere, which is several hundred kilometers thick. Heat within the asthenosphere creates convection currents (similar to the currents that can be seen in the lava lamp).