0
Makes it hard .(:
Wiki User
∙ 12y ago
Wiki User
∙ 12y agono
Add your answer:
Earn +20 pts
What does grain-size tell you about the cooling history of a rock?
Slower rates of cooling will create larger crystals. Rapid cooling allows little time for element accumulation in the crystal, therefore, the crystals created will be smaller. Larger, visible crystals in igneous rock indicate that the magma was slow cooling, usually at depth. Much smaller crystals in igneous rock indicate rapid cooling of lava, usually at or near the surface. Crystals in igneous rock will grow larger and have more time to accumulate material for their growth the more time they have at their crystallization temperature.
Is obsidian a sedimentary rock igneous rock or a metamorphic rock?
obsidian is an igneous rock, it is not formed from sediment, or a rock going under heat and pressure for the second time it is formed when a volcano erupts and it cools very quickly giving it a smooth glossy surface like glass.
Why is rock gypsum a sedimentary rock?
Gypsum is a mineral that was formed by layers of sediment , fine particles, that were deposited over a period of time, and then subjected to geologic forces.
Would the oldest rocks on earth be igneous or sedimentary?
The creation of igneous rock from magma is dependent on the cooling rate of the magma. Some igneous rocks form almost instantaneously, and others take hundreds of thousands of years. So igneous rock could be the youngest of the three rock types at any given point in time.
How does sedimentary rock and igneous rock form?
Sedimentary rock is formed from different sediments (rock, dirt, bits of each, etc.), over time, pushed and pressured into a solid, a rock. Igneous rocks are formed by the cooling of lava, which is rock anyway, only melted.Example of Sedimentary- sandstoneExample of Igneous- obsidian
How is the size of crystals in an igneous rock related to the formation of a rock?
If an igneous rock is formed from slowly cooling magma under the ground, it has more time to form crystals and so the crystals it forms are much larger than igneous rock formed from more quickly cooling magma or lava.
What factors can affect the texture of an igneous rock?
The length of time the magma had to cool
What do large crystal grains in an igneous rock indicate?
A vesicular igneous texture generally indicates rapid cooling.
What does quick cooling of ejected lava result in?
Quick cooling lava will result in extrusive igneous rock, a type of rock classification based on its small crystals being formed from lack of time for growth during solidification.
Does obsididan rock have large mineral grains?
No. Obsidian is formed by the very rapid cooling of lava which means that crystals do not have time to form.
Do igneous rocks cool quickly underground?
Intrusive igneous rock is formed underground from slow cooling of magma. The resultant rock stays hot for long periods of time.
How does the cooling rte of rocks affect the crystal size?
If rock cools quickly it does not have time to form large crystals and so it forms small ones. At slower cooling rates there is time to form larger crystals.
How is a monolith formed?
A monolith is a large single upright block of stone, typically formed through geological processes such as volcanic activity, erosion, or tectonic movements. These processes can create tall and isolated rock formations that stand out in their surroundings.
What is obsadian?
Obsidian is a rock that is essentially natural glass. Obsidian is formed by high volcanic heat and very fast cooling (So that crystallization has no time to occur).
Does color affect cooling time of objects?
color only affects the cooling time of objects if there is light
What does not affect the type of igneous rock that forms?
The time of day. The list is endless. It would be far easier to answer the opposite question. It IS affected by mineralogy, cooling time and a little by pressure.
How do newly formed clouds affect the normal heating and cooling cycle of weather?
It makes it cooler in the day time, but the heat stored makes it warmer at night
