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Metamorphism involves the addition of what to pre-existing rock?
Metamorphism involves the addition of heat and/or pressure to pre-existing rock, which causes physical and chemical changes without melting the rock entirely. This process can result in the formation of new minerals, texture changes, and sometimes the alignment of mineral grains in a specific direction.
Does pumic have mineral grains?
Pumice does not have grains.
What do metamorphic rocks with a non-foliated texture show metamorphic changes involve?
Metamorphic rocks with a non-foliated texture show that the metamorphic changes involved did not result in the development of a preferred alignment of mineral grains. This indicates that the rocks were subjected to directed pressure or high temperatures without causing the minerals to align into layers. Examples of non-foliated rocks include marble and quartzite.
How is the size of the mineral grains affect by the rate at which molten rock material rock?
The slower the rate of cooling the larger the size of the crystals that can develop.
When granite is subjected to high enough amounts of heat and pressure to change it but not melt it granite changes to?
When granite is subjected to high heat and pressure without melting, it transforms into a metamorphic rock known as gneiss. This process involves the recrystallization of the minerals within the granite, leading to the alignment of mineral grains and the development of distinct foliation or banding. Gneiss typically exhibits a coarser texture compared to granite and may display a variety of colors depending on its mineral composition.
Does obsidian rock contain few or no mineral grains?
Obsidian is a type of volcanic glass that lacks a crystalline structure, so it does not contain mineral grains. It forms from quickly cooling lava rich in silica, resulting in a smooth, glassy texture without distinct mineral crystals.
When water combines with mineral grains do the grains become smaller or larger?
When water combines with mineral grains, the grains can become smaller due to mechanical weathering processes like abrasion and attrition, where the movements of water cause the grains to break down into smaller pieces. However, in some cases, water can also facilitate processes like dissolution or precipitation that can lead to mineral grains growing larger.
What rock has large mineral grains?
Fine grains of rocks are referred to as "clasts." The word "clast" comes from the Greek word "klastos," meaning "broken."
Why does obsidian contain few or no mineral grains?
The material that would normally form mineral crystals does not have time to form a crystalline structure because of very rapid cooling after volcanically erupting into the air or onto the surface. Obsidian is a volcanic glass.
Bowen's reaction series predicts the sizes of the different mineral grains that grow from crystallizing magmas true or false?
True. Bowen's reaction series is a concept in geology that predicts the order in which certain minerals crystallize from a cooling magma based on their melting points. This series helps to explain how different mineral grains of varying sizes form as the magma cools.
What kind of mineral has a large grains?
Intrusive
What is a rock with long flat mineral grains?
A rock with long flat mineral grains is likely to be schist. Schist is a metamorphic rock characterized by its foliated texture, with mineral grains aligned in a parallel fashion, giving it a distinct layered appearance.
