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Geodes are formed in a cavity such as might be found inside a fossil shell buried in sediment. At the beginning, this cavity is probably filled with a concentrated salt solution. The first step in the creation of a geode is the formation along the inner cavity wall of a layer of gelatinous silica, which will eventually be transformed into the chalcedony layer. As the water surrounding the layer becomes less salty, osmosis induces migration of fluids into the cavity. This results in a buildup of pressure, causing the cavity to expand until the water inside and outside is equally salty. When the silica gel dehydrates, crystallizes to form chalcedony, and cracks, mineral-bearing water enters to slowly deposit the inward-projecting crystals".
Geodes are formed when minerals dissolved in water enter empty spaces in sedimentary or volcanic rocks, such as limestone or basalt. Over time, the minerals crystallize inside the cavity, forming the hollow, spherical shape characteristic of geodes. The size and color of a geode depend on the type of minerals present in the water during its formation.
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Name four clastic sedimentary rocks and explain how these rocks form?
Sandstone: formed by the cementation of sand grains. Conglomerate: formed by the cementation of rounded pebbles. Siltstone: formed by the compaction of silt-sized particles. Shale: formed by the compaction of clay and silt particles.
What sedimentary rocks are formed from the remains of plants and animals?
Sedimentary rocks formed from the remains of plants and animals are called organic sedimentary rocks. Examples include coal, formed from the remains of plants, and limestone, formed from the shells of marine organisms.
What are the three kinds of rocks tell how each formed?
The three types of rocks are igneous, formed from the cooling of magma or lava; sedimentary, formed from the accumulation of sediments over time; and metamorphic, formed from the alteration of existing rocks due to heat and pressure.
Where is each type of igneous rock formed?
Intrusive igneous rocks are formed underground from the slow cooling of magma. Extrusive igneous rocks are formed on the Earth's surface from the rapid cooling of lava.
According to the following reaction how many grams of sulfur are formed when 37.4 g of water are formed?
To determine the grams of sulfur formed, we need to first identify the balanced chemical equation for the reaction involving sulfur. Once we have the balanced equation, we can use stoichiometry to determine the mass of sulfur formed using the given value of water formed.
How was the Supreme Court formed?
it was formed by being formed
How is starches formed?
starch is formed by fermentation.
How are gulfs formed?
Gulfs are formed by erosion. Gulfs are formed by erosion.
Who formed the spice girls formed?
The Spice Girls were formed by Chris Herbert.
What solid is formed when magnesium carbonate is formed?
Magnesium oxide is formed, i think(:
How are sandunes formed?
It is formed by the wind
How is a guyot formed?
They are formed by erosion
When was the himalayus formed?
when was the Himalayas formed?
Why was the cold war formed?
It did not get formed
Who were formed by the plebeians?
The formed province
How was this planet formed?
how was this planet formed
How are canyans formed?
they are formed by rivers.
