There are three main types of lava: a'a, pahoehoe and pillow lava. Each one flows at a different rate and has a different mineral composition.
A'a is the slowest flowing type of lava. Its flow is characterized by its rough outer surface that, once hardened, turns into a sharp, spiny surface that makes travel difficult. The second kind of lava is pahoehoe; it is the fastest flowing lava. These thin lava flows can stretch for miles and form a crust that is very smooth. The last kind of lava is pillow lava, which is normally found underwater. As it erupts and cools due to the water, cracks form and lava oozes out, producing a crust that resembles a pillow.Learn More
Hot melted rocks collect under the Earth's surface and when the pressure becomes too hard, the Earth's skin breaks, and a volcano erupts. The melted rock inside the Earth is called magma, but when it comes out in an eruption, it is called lava.Full Answer >
Volcanologists wear heavy boots, long-sleeved shirts and heavy work gloves in order to protect their bodies from lava near a volcano. According to Oregon State University, volcanologists might also wear jeans, a rock-climbing helmet for protection and a gas mask.Full Answer >
The inside of a volcano has one or more vents through which gas and lava flow during eruptions. Below the vent is the magma, which is the molten rock that flows upward due to the divergence or convergence of tectonic plates in the Earth's crust. The number of vents and shape of the buildup of magma inside the magma chamber depends upon the type of volcano.Full Answer >
Oshima as an island stratovolcano with a large caldera on its summit. Stratovolcanoes are conical volcanoes built up by many layers of hardened lava and volcanic ash, with steep profiles and periodic eruptions.Full Answer >