When a volcano erupts, it sends out bits of rock, lava (solidified magma) and ash into the air. Then, gravity pulls the debris towards the ground so the debris drop, or fall, from the air.
tephra and ash bombs
When a volcano erupts, it sends out bits of rock, lava (solidified magma) and ash into the air. Then, gravity pulls the debris towards the ground so the debris drop, or fall, from the air.
Ash
Tephra
Tephra
tephra, or debris from the eruption of a volcano:)
Lava rock with air pockets are known as vesicular lava rock. These air pockets are formed during the solidification process of lava, which traps gas bubbles within the rock. This gives the rock a porous and lightweight texture.
rock, ash, lava
The common usage of "lava rock" in the USA refers to a black rock with a number of visible bubbles or air pockets that is formed from cooled lava on the surface. Although lava rock is an igneous rock, it is not the same as the definition for the word igneous, which can also include igneous rocks which have solidified from magma below the surface.
extrusive igneous rock
igneous rock
Lava rock is formed when molten lava from a volcano cools and solidifies on the Earth's surface. This process involves the lava cooling rapidly, either in the air or in water, which causes it to harden into a rock-like structure. Over time, the lava rock can weather and erode, eventually breaking down into smaller pieces.