Rocks formed from lava (known as extrusive igneous rocks, because the lava comes to the surface) can be any size - large or small. However, the density of the rock and the size of the crystals making up the rock is informative. Less "thick" (viscous) lava will produce higher-density rocks. The more silicon is contained in the lava/rocks, the thicker it will be. Thinner lava contains more iron and less silicon. The faster a lava cools, the smaller the crystals in the rock will be. By using crystal size in minerals, geologists can determine how fast the lava cooled, which helps to determine the type of eruption and the surface conditions when it occurred.
It would have small crystals as the rapid cooling would not allow much time for crystal growth.
Lava cools rapidly on the Earth's surface and so has small crystals.
No. Small crystals form.
That's because of the cooling speed. When a magma or a lava cools, it forms crystals. The longer these crystals have the time to form, the larger they will be. However, at the surface, the lava cools relatively fast (at least, compared to magma that stays inside the earth). The crystals in the rock that forms that way don't have a lot of time to form, so don't grow big.
Yes.
Yes. Rapid cooling of molten rock produces small crystals.
It depends how slow/fast it cools into a rock. The slower it cools, the larger the crystals. The faster it cools, the smaller the crystals. It can also have no crystals. Let's say lava shot itself into the water. It cools so fast it might not have crystals
No. Small crystals form.
fast cooling lava -small crystals or no crystals
fast cooling lava -small crystals or no crystals
That's because of the cooling speed. When a magma or a lava cools, it forms crystals. The longer these crystals have the time to form, the larger they will be. However, at the surface, the lava cools relatively fast (at least, compared to magma that stays inside the earth). The crystals in the rock that forms that way don't have a lot of time to form, so don't grow big.
large crystals (that form from volcanoes) form when lava under ground gets separated from the main lava chamber and begins slowly cooling. Smaller crystals form when either, one: Volcanoes erupt and lava cools, or two: Lava under ground gets separated from main lava chamber close to the surface and cools fairly quickly.
If lava cools quickly, the minerals don't have as much time to form crystals, so the crystals do not become very large. Igneous rocks that cooled quickly and have small crystals are described as "aphanitic" igneous rocks.
It is true that lava cools quickly and forms minerals with small crystals.
diorite crystals are large and andesite crystals are small
Yes.
Yes. Rapid cooling of molten rock produces small crystals.
It depends how slow/fast it cools into a rock. The slower it cools, the larger the crystals. The faster it cools, the smaller the crystals. It can also have no crystals. Let's say lava shot itself into the water. It cools so fast it might not have crystals
another name for the mineral crystals in cooling magma or lava