What is the difference between a dike and a sill quizlet?
What is the difference between a dike and a sill? Dikes are formed across vertical cracks, and sills are formed across horizontal ones.
What is a sill?
Definition of sill 1 : a horizontal piece (such as a timber) that forms the lowest member or one of the lowest members of a framework or supporting structure: such as. a : the horizontal member at the base of a window. b : the threshold of a door.
What is an example of a sill?
The definition of a sill is a horizontal piece of a frame, generally made out of wood, for a window or door. An example of a sill is where a cat may sit looking out the window. (geol.) A flattened piece of igneous rock forced between beds of stratified rocks.
What is difference between vein and Dyke?
Unlike dikes, veins form by minerals crystallizing out of water in a crack, often near the earth's surface. They are (usually) smaller, more sparkly, and more irregular than dikes, but (sometimes) the smallest of dikes can be confused with the larger and straighter vein types.
Why are the dikes and sills so easily distinguished?
Why are the dikes and sills so easily distinguished in Sinbad country? Basalt and the hardened, baked zones are more resistant to erosion than the sedimentary rocks. Why are sills only located fairly close to the Earth's surface? Sills form as magma intrudes with enough force to overcome the weight of the rocks above.
What is phaneritic and aphanitic?
APHANITIC TEXTURE – Igneous rocks that form on the earth's surface have very fine-grained texture because the crystals are too small to see without magnification. PHANERITIC TEXTURE – Igneous rocks with large, visible crystals because the rock formed slowly in an underground magma chamber.
What is another word for sill?
In this page you can discover 21 synonyms, antonyms, idiomatic expressions, and related words for sill, like: ledge, transom, grille, cill, threshold, beam, batholith, doorstone, mudsill, lintel and roof.
How is sills formed?
Sills: form when magma intrudes between the rock layers, forming a horizontal or gently-dipping sheet of igneous rock.
How Dyke is formed?
When molten magma flows upward through near-vertical cracks (faults or joints) toward the surface and cools, dykes are formed. Dykes are sheet-like igneous intrusions that cut across any layers in the rock they intrude.
What do dikes look like?
A geologic dike is a flat body of rock that cuts through another type of rock. Dikes cut across the other type of rock at a different angle than the rest of the structure. Dikes are usually visible because they are at a different angle, and usually have different color and texture than the rock surrounding them.
Where are dikes located?
Dikes are man-made structures that defend against natural forces like water, climate and altitude and are mostly constructed of material found on site. Over the centuries, the Netherlands had frequently been flooding, from the rivers as well as the sea in varying degrees and severity.
How are sills and dikes similar how do they differ give an example of each?
How are dikes and sills similar? The difference between a dike and a sill is that dykes are formed across or vertical to the rock while sill are on horizontal cracks. However, they are both sedimentary in nature. Both are intrusive, where magma flows through the outer crust.
How sills are formed?
Sills: form when magma intrudes between the rock layers, forming a horizontal or gently-dipping sheet of igneous rock.
What is meant by aphanitic?
Aphanitic is a descriptive term for small crystals, and phaneritic for larger ones. Very coarse crystals (those larger than 3 centimetres, or 1.2 inches) are termed pegmatitic. In igneous rock.
What is a phenocrysts in geology?
A relatively large crystal embedded in a finer-grained or glassy igneous rock. The presence of phenocrysts gives the rock a porphyritic texture (see illustration). Phenocrysts are represented most commonly by feldspar, quartz, biotite, hornblende, pyroxene and olivine.
What is another word for Weir?
What is another word for weir?
| barrier | wall |
|---|---|
| dam | barrage |
| levee | dike |
| embankment | obstruction |
| gate | bank |
Is it Windowill or window sill?
A window sill (also written windowsill or window-sill, and less frequently in British English, cill) is the horizontal structure or surface at the bottom of a window. Window sills serve to structurally support and hold the window in place.
What is sills in geology?
sill, also called sheet, flat intrusion of igneous rock that forms between preexisting layers of rock. Sills occur in parallel to the bedding of the other rocks that enclose them, and, though they may have vertical to horizontal orientations, nearly horizontal sills are the most common.
What are sills in geology?
sill, also called sheet, flat intrusion of igneous rock that forms between preexisting layers of rock. Sills occur in parallel to the bedding of the other rocks that enclose them, and, though they may have vertical to horizontal orientations, nearly horizontal sills are the most common.
What is the purpose of a dike?
A dike is a barrier used to regulate or hold back water from a river, lake, or even the ocean. In geology, a dike is a large slab of rock that cuts through another type of rock.
What are sills in geography?
sill, also called sheet, flat intrusion of igneous rock that forms between preexisting layers of rock. Sills occur in parallel to the bedding of the other rocks that enclose them, and, though they may have vertical to horizontal orientations, nearly horizontal sills are the most common.
How is sill formed?
Sills: form when magma intrudes between the rock layers, forming a horizontal or gently-dipping sheet of igneous rock.
Where are sills found?
sill, also called sheet, flat intrusion of igneous rock that forms between preexisting layers of rock. Sills occur in parallel to the bedding of the other rocks that enclose them, and, though they may have vertical to horizontal orientations, nearly horizontal sills are the most common.
How does dike form?
Dikes are made of igneous rock or sedimentary rock. Igneous rock is formed after magma, the hot, semi-liquid substance that spews from volcanoes, cools and eventually becomes solid. Magmatic dikes are formed from igneous rock. Sedimentary rock is made of minerals and sediments that build up over time.
Is granite an aphanitic?
Granite, the most well known example of an intrusive igneous rock, has a phaneritic texture.
What is Phaneritic and Aphanitic?
APHANITIC TEXTURE – Igneous rocks that form on the earth's surface have very fine-grained texture because the crystals are too small to see without magnification. PHANERITIC TEXTURE – Igneous rocks with large, visible crystals because the rock formed slowly in an underground magma chamber.
What is a matrix in rocks?
matrix, in geology, the material in which something is embedded, either the natural rock that holds crystals, fossils, pebbles, mineral veins, and the like, or the fine-grained materials that surround larger grains in a rock—e.g., silt and clay particles in a sandstone or tiny crystals in a crystalline rock, sometimes …
What is the purpose of a weir in a river?
A weir is a small dam built across a body of water, such as a river. We use them to help control the flow of water. Weirs can help raise the water level so that boats can pass through, and they can also reduce the flow of water to prevent flooding.
What is a synonym for Hart?
hart Definitions and Synonyms an old word for a 'male deer'. A more usual word is stag. Synonyms and related words. Male animals.
What is a window sill called?
A window sill, also known as a window ledge or window bottom, is the shelf-like, flat piece of the window trim found at the base of the window. Window sills are important to the design and functionality of the window.