Understanding Earth's Lithosphere: Tectonic Plates
The question asks to identify the term for a massive, irregularly shaped slab of solid rock that includes both continental and oceanic lithosphere. Let's break down the definition and analyze the options.
Definition of a Tectonic Plate
A tectonic plate is a large, fundamental unit of the Earth's lithosphere. The lithosphere is the rigid outer part of the Earth, consisting of the crust and the upper mantle. These plates are massive, irregularly shaped, and they float on the semi-fluid asthenosphere beneath them. They are constantly moving, albeit very slowly, which causes geological phenomena like earthquakes and volcanic activity.
Crucially, tectonic plates can be composed of:
- Continental lithosphere: Thicker, less dense crust found under continents.
- Oceanic lithosphere: Thinner, denser crust found under oceans.
- Both: Many tectonic plates are composite, containing sections of both continental and oceanic lithosphere.
Analyzing the Options
- Landforms: This is a general term for features on the Earth's surface like mountains, valleys, and plains. While landforms are related to geological processes, "landform" itself does not describe a massive slab of rock forming the lithosphere.
- Tectonic plate: This option perfectly matches the description. It is a massive, irregularly shaped slab of solid rock (lithosphere) that can be composed of both continental and oceanic crust.
- Pacific plate: This is a specific example of a tectonic plate. While it fits the description of a massive slab, the question is asking for the general term, not a specific instance.
- Continental plate: This term refers specifically to plates dominated by continental lithosphere. While it is a type of tectonic plate, it doesn't fully encompass plates that also contain significant portions of oceanic lithosphere, which the question requires.
Conclusion
Based on the definition provided in the question – a massive, irregularly shaped slab of solid rock generally composed of both continental and oceanic lithosphere – the most accurate and general term is tectonic plate.
Important Questions from Environment Awareness
- Environmental education is a process of recognizing the interrelatedness among men, his ________ and biological surrounding.
- A product of incomplete combustion having chars and roots is termed as
- The constitution of inorganic and organic matter of a productive soil are __________ and __________ respectively.
- Statement I
Ground displacement, demolition of buildings, flooding are effects of Earthquake
Statement II
Earthquake in ocean floor do not create Tsunamis as seismic waves - According to __________ the origin of planets is the result of some event in space like the collision or close approach of two stars in space.
