it would be lava , magma is in the ground and flows on earths surface and cools to lava
glassy texture
The center of the earth is the hottest, and the crust is the furthest away from that heat.
It is true that lava cools quickly and forms minerals with small crystals.
Lava cools slowly because lava is a poor conductor of heat. Lava flows slow down and thicken as they harden.
it would be lava , magma is in the ground and flows on earths surface and cools to lava
it explodes
Magma that cools quickly forms into igneous rock, when it cools quickly it becomes a lava rock. Lava cools very quickly at first and forms a thin crust that insulates the interior of the lava flow.
fast cooling lava -small crystals or no crystals
fast cooling lava -small crystals or no crystals
glassy texture
Lava will cool quickly compared to underground magma.
Pumice.
The center of the earth is the hottest, and the crust is the furthest away from that heat.
When lave cools fairly quickly, but not instantaneously, the rock that is producing will have small or nearly invisible crystalsform.
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.