All of the following are extrusive landforms except, a concept that challenges the conventional understanding of volcanic formations. This article delves into the fascinating world of landforms, exploring the unique characteristics and processes that shape these geological wonders.
Extrusive landforms, formed by the eruption of molten rock onto the Earth’s surface, are a testament to the dynamic nature of our planet. However, not all landforms owe their existence to volcanic activity. This article uncovers the exceptions to the rule, examining landforms that defy the conventional definition of extrusive formations.
Extrusive Landforms
Extrusive landforms are formed when molten rock, known as magma, rises to the surface of the Earth and solidifies. These landforms are characterized by their steep slopes and rugged terrain.
Examples of extrusive landforms include:
- Volcanoes
- Lava domes
- Cinder cones
Volcanoes are the most common type of extrusive landform. They are formed when magma rises to the surface of the Earth and erupts through a vent in the ground. Lava domes are formed when magma is too viscous to flow easily and builds up around the vent.
Cinder cones are formed when magma is ejected into the air and falls back to the ground, forming a cone-shaped hill.
Non-Extrusive Landforms
Non-extrusive landforms are formed by processes other than volcanic activity. These landforms are typically more gently sloping and have a smoother surface than extrusive landforms.
Examples of non-extrusive landforms include:
- Mountains
- Plateaus
- Canyons
Mountains are formed by the uplifting of the Earth’s crust. Plateaus are formed when a large area of land is uplifted and eroded, leaving a flat-topped surface. Canyons are formed when a river erodes a deep, narrow valley into the Earth’s surface.
Exceptions to the Rule
There are a few landforms that are not formed by volcanic activity but are still considered to be extrusive landforms. These landforms include:
- Dikes
- Sills
- Laccoliths
Dikes are formed when magma fills a crack in the Earth’s crust. Sills are formed when magma fills a layer of rock that is parallel to the Earth’s surface. Laccoliths are formed when magma pushes up into a layer of rock but does not break through the surface.
Comparative Analysis: All Of The Following Are Extrusive Landforms Except
Extrusive and non-extrusive landforms are two distinct types of landforms that are formed by different processes. Extrusive landforms are formed by volcanic activity, while non-extrusive landforms are formed by other processes such as uplifting, erosion, and deposition.
The following table summarizes the key differences between extrusive and non-extrusive landforms:
| Characteristic | Extrusive Landforms | Non-Extrusive Landforms |
|---|---|---|
| Formation process | Volcanic activity | Uplifting, erosion, and deposition |
| Slope | Steep | Gentle |
| Surface | Rugged | Smooth |
| Examples | Volcanoes, lava domes, cinder cones | Mountains, plateaus, canyons |
Common Queries
What are extrusive landforms?
Extrusive landforms are geological formations created by the eruption of molten rock onto the Earth’s surface.
What are non-extrusive landforms?
Non-extrusive landforms are geological formations that are not formed by volcanic activity but rather by other processes such as erosion, deposition, or tectonic uplift.
What are some examples of exceptions to the rule that all extrusive landforms are formed by volcanic activity?
Some examples of exceptions to this rule include sand dunes, coral reefs, and glacial moraines.
