When a stalactite meets a stalagmite The result is?
Unlike stalactites, stalagmites never start out as hollow "soda straws". Given enough time, these formations can meet and fuse to create a speleothem of calcium carbonate known as a pillar, column, or stalagnate.
Is the term for solution topography in areas of limestone bedrock quizlet?
________ is the term for solution topography in areas of limestone bedrock. Karst. You just studied 37 terms!
Which of the following is an example of a Speleothem?
Common speleothems include dripstones (such as stalactites, stalagmites, straws, columns, or pillars), flowstones (such as shawls, curtains, draperies, or "cave bacon"), pore deposits (such as helictites and cave corals), and pool deposits (such as rimstone, dogtooth spar, cave pearls, shelftstone, or lily pads).
Is the term for topography in which limestone bedrock has been dissolved to create distinctive landforms?
Karst is a type of landscape where the dissolving of the bedrock has created sinkholes, sinking streams, caves, springs, and other characteristic features. Karst is associated with soluble rock types such as limestone, marble, and gypsum.
What are icicles in caves called?
Stalagmites and stalactites are some of the best known cave formations. They are icicle-shaped deposits that form when water dissolves overlying limestone then re-deposits calcium carbonate along the ceilings or floors of underlying caves. Stalactites form along ceilings and hang downward.
What type of weathering occurs when stalactites and stalagmites on caves are formed *?
Stalactites and stalagmites are formed by chemical weathering. Water dissolves the calcites in the rock of a cave roof and the calcite is deposited as strange and wonderful structures below.
What is the term describing the ability of a geologic material to transmit a fluid?
Permeability refers to the ability of a material to transmit a fluid through it.
Which of the following are common features of karst landscapes?
karst, terrain usually characterized by barren, rocky ground, caves, sinkholes, underground rivers, and the absence of surface streams and lakes.
What are mineral deposits in caves called?
A speleothem (/ˈspiːliəθɛm/; from Ancient Greek σπήλαιον (spḗlaion) 'cave', and θέμα (théma) 'deposit') is a geological formation by mineral deposits that accumulate over time in natural caves. Speleothems most commonly form in calcareous caves due to carbonate dissolution reactions.
What is cave deposit?
cave deposit, also called speleothem, any of the crystalline deposits that form in a solution cave after the creation of the cave itself. These deposits are generally composed of calcium carbonate dissolved from the surrounding limestone by groundwater.
What type of landform occurs when underground limestone is dissolved by acidic groundwater?
Limestone dissolves under the action of rainwater and groundwater charged with H2CO3 (carbonic acid) and naturally occurring organic acids. The dissolution process produces a distinctive landform known as karst, characterized by sinkholes, and underground drainage.
Why are caves caverns and sinkholes associated with carbonate formations?
As water laden with dissolved carbonate seeps into the air-filled cave passage, it may lose excess carbon dioxide to the cave atmosphere, or the water itself may evaporate, causing the dripwater to precipitate secondary carbonate or other minerals from solution, creating cave formations or speleothems including cone- …
Are icicles stalactites?
Although stalactites (image) and icicles (image) have similar shapes, they don't have any physics in common. Icicles grow from heat diffusion and rising warm air, while stalactites rely on the diffusion of carbon dioxide gas to grow.
How are caverns formed?
Between the layers of rock and inside the joints, the water slowly dissolved away the rock. This made a large water-filled space. As the Current River cut its river valley, it cut down through the rock layers until it opened up the cave. This let the water out and gave us an air-filled cave.
What type of weathering is minerals in rocks to dissolve and then form stalactites and stalagmites in a cave?
Water also interacts with calcites in caves, causing them to dissolve. Calcite in dripping water builds up over many years to create stalagmites and stalactites. In addition to changing the shapes of rocks, chemical weathering from water changes the composition of water.
How are caves and caverns formed?
Caves are formed by the dissolution of limestone. Rainwater picks up carbon dioxide from the air and as it percolates through the soil, which turns into a weak acid. This slowly dissolves out the limestone along the joints, bedding planes and fractures, some of which become enlarged enough to form caves.
How do stalactites and stalagmites form quizlet?
Stalactites and stalagmites are formed when groundwater leaks through the ceiling of a cavern and drips to the floor. As the drop forms it may deposit sediments on the ceiling or floor of the cavern. As these sediments form it creates stalactites and stalagmites.
What is porosity in geology?
More specifically, porosity of a rock is a measure of its ability to hold a fluid. Mathematically, it is the open space in a rock divided by the total rock volume (solid and space). Permeability is a measure of the ease of flow of a fluid through a porous solid.
What is the name of an icicle like Speleothem that grows down from the roof of a cavern?
quiz 11 geol
| Question | Answer |
|---|---|
| A ________ is the icicle-like speleothem that grows down from the roof of a cavern | stalactite |
| ________ is the volume of voids or open space in a rock or unconsolidated material. | Porosity |
| The water table is ________. | a boundary between saturated rock below and unsaturated rock above |
How are caves formed?
Caves are formed by the dissolution of limestone. Rainwater picks up carbon dioxide from the air and as it percolates through the soil, which turns into a weak acid. This slowly dissolves out the limestone along the joints, bedding planes and fractures, some of which become enlarged enough to form caves.
What are stalactites and stalagmites?
Stalactites grow down from the cave ceiling, while stalagmites grow up from the cave floor. It's easy to remember which is which: Stalactites have a "T" for top and stalagmites have a "G" for ground. Speleothems actually form because of water. Rainwater seeps through cracks in the rock.
Are caves formed by erosion or deposition?
Caves are one of the types of landforms created by groundwater erosion. Working slowly over many years, groundwater travels along small cracks. The water dissolves and carries away the solid rock. This gradually enlarges the cracks.
What feature is formed when calcium carbonate is deposited on the floor of a cave?
Stalagmites Stalagmites. As water drips from the ceiling onto the floor of the cave, calcium carbonate may be deposited on the floor of the cave. Over time this may form an elongated feature which rises vertically from the cave floor. This feature is known as a stalagmite.
How is icicle formed?
Icicles can form during bright, sunny, but subfreezing weather, when ice or snow melted by sunlight or some other heat source (such as a poorly insulated building), refreezes as it drips off under exposed conditions. Over time continued water runoff will cause the icicle to grow.
Are caves formed by chemical weathering?
This lab activity will focus on a chemical weathering process called dissolution. Dissolution occurs when rocks are dissolved. Caves are formed when dissolved particles are washed away and leave hollow spaces behind.
What are the icicles in caves called?
Stalagmites and stalactites are some of the best known cave formations. They are icicle-shaped deposits that form when water dissolves overlying limestone then re-deposits calcium carbonate along the ceilings or floors of underlying caves. Stalactites form along ceilings and hang downward.
What type of weathering occurs when stalactites in caves are formed?
Stalactites and stalagmites are formed by chemical weathering. Water dissolves the calcites in the rock of a cave roof and the calcite is deposited as strange and wonderful structures below.
How groundwater creates caverns quizlet?
How does groundwater create caverns? Most caverns are made at or below the water table. Acidic groundwater finds lines of weakness in the rock, and slowly dissolves it along those joints. Over much time, enough rock is dissolved to create caverns.
What is porosity geology quizlet?
Porosity. The percentage of open spaces in a rock or sediment.
How are igneous rocks formed?
Igneous rocks (from the Latin word for fire) form when hot, molten rock crystallizes and solidifies. The melt originates deep within the Earth near active plate boundaries or hot spots, then rises toward the surface.