Plate tectonics is a scientific theory that explains how major landforms are created as a result of Earth’s subterranean movements. In plate tectonics, Earth’s outermost layer, or lithosphere—made up of the crust and upper mantle—is broken into large rocky plates.

What are the words related to plate tectonics?

Explore the Words

  • crustal plate. a rigid layer of the Earth’s crust that is believed to drift slowly.
  • tectonics. the branch of geology studying the folding and faulting of the earth’s crust.
  • plate tectonics. the movement or study of the movement of Earth’s crust.
  • Hadean eon.
  • subduction.
  • archaean.
  • hafnium.
  • Hadean.

What is the definition of plate tectonics in science?

plate tectonics, theory dealing with the dynamics of Earth’s outer shell—the lithosphere—that revolutionized Earth sciences by providing a uniform context for understanding mountain-building processes, volcanoes, and earthquakes as well as the evolution of Earth’s surface and reconstructing its past continents and …

What is the definition of Earth’s plates?

A tectonic plate (also called lithospheric plate) is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere. The variations in plate thickness are nature’s way of partly compensating for the imbalance in the weight and density of the two types of crust.

What are plate tectonics quizlet?

plate-tectonics. the theory that states that pieces of Earth’s lithosphere are in constant slow motion. convection currents. currents in the mantle that cause the movement of Earth’s plates.

What is plate tectonic fault?

A fault is a fracture or zone of fractures between two blocks of rock. Faults allow the blocks to move relative to each other. Earth scientists use the angle of the fault with respect to the surface (known as the dip) and the direction of slip along the fault to classify faults.

What is the best definition of plate tectonics?

Definition of plate tectonics 1 : a theory in geology: the lithosphere of the earth is divided into a small number of plates which float on and travel independently over the mantle and much of the earth’s seismic activity occurs at the boundaries of these plates.

What are plate tectonics Class 9?

Plate tectonics is the theory that Earth’s outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core. The plates act like a hard and rigid shell compared to Earth’s mantle. This strong outer layer is called the lithosphere.

What made tectonic plates?

The plates — interlocking slabs of crust that float on Earth’s viscous upper mantle — were created by a process similar to the subduction seen today when one plate dives below another, the report says. Other researchers have estimated that a global tectonic plate system emerged around 3 billion years ago.

Why does the Earth have plate tectonics?

Earth is the only planet we know of that has plate tectonics. Too big and its powerful gravitational field squeezes any plates together, holding them tightly in place. The conditions also have to be just right: the rocks making up the planet should be not too hot, not too cold, not too wet and not too dry.