Igneous Rocks
This is the most common aphanitic igneous rock
What is basalt?
The process of dissolved minerals precipitating from water and gluing together sediment into a rock is called this.
What is cementation?
This word is used to describe many tons of weight pressing down on sediments to cause it to form a sedimentary rock.
What is compaction?
Extrusive or volcanic rocks have mineral crystals so small that they cannot be seen without magnification. This type of texture is called....
What is Aphanitic?
This type of intrusive igneous rock has the same composition as rhyolite, but because it cooled more slowly, has large crystals and is commonly used to make counter tops and other surfaces in homes and construction.
What is granite?
This feature of volcanic rock allows them to most easily be distinguished from intrusive igneous rocks.
What is the size of the mineral grains?
If all the sediment of a sample is of about the same size, it is called this.
What is well sorted?
These rocks all have Calcium carbonate as a main ingredient.
What are carbonate rocks?
Intrusive igneous rocks have crystals that can be seen with the naked eye. This kind of texture is called....
What is phaneritic?
This extrusive igneous rock is commonly found around Alamo and is formed mainly from pyroclastic material that has been compacted together.
What is volcanic tuff?
An igneous that possesses a variety of mineral grains of markedly different sizes is called this.
What is a Porphyry?
This type of sediment was broken from or weathered from a parent rock.
What is detrital sediment?
This item which is evidence of prehistoric life, can often be found in sedimentary rocks, but not igneous or metamorphic rocks.
What is a fossil?
Extrusive igneous rock that is still molten and flows is called this.
What is lava?
This type of sedimentary rock is formed from grains smaller than 2 mm but still big enough to see with the naked eye.
What is sandstone?
This is the process by which a body of magma reacts with and incorporates pre-existing rock.
What is Assimilation?
Dolostone and Limestone form from minerals that precipitate from water and fall to the bottom of oceans or large lakes. They are not detrital sedimentary rocks but are called this instead.
What is a Chemical sedimentary rock?
This type of rock is formed when the water it is dissolved in dries up.
What is Evaporite?
The material that volcanoes blast into the air is called this.
What are pyroclastic materials?
siltstone, claystone, shale, slate and mudstone are all detrital sedimentary rocks that form from particles that are too small to see with the naked eye. The overall name for these rocks is this.
What is mudrocks or mudstone?
Igneous rocks that are composed largely of ferromagnesian minerals are characterized as this.
What is Mafic?
Calcium Carbonate is one of the minerals that act as a cement in some sedimentary rocks. This is the other most common cement mineral.
What is silica?
As sediments are transported in rivers and streams the sharp edges are gradually knocked off and worn away resulting in this.
What is rounding?
This type of magma has a large proportion of silica in it which makes it very viscous and more likely to cause explosive eruptions.
What is Felsic magma?
This intrusive igneous rock has the same minerals as Basalt, but has larger crystals that can be seen without magnification.
What is gabbro?