When a volcano enters eruption ejects a very dense material, with a high temperature and a reddish appearance, washing it. As for the name, if the lava is located in the interior of the Earth receives the name of magma and at the time in which the lava solidifies it is known as volcanic rock. Depending on the intensity of an erupting volcano, the lava creates grooves and rivers which ravage with vegetation and any form of life. In this sense, the rivers of lava are a threat to human populations that may be affected by the action of a volcano. Thus, when some landscapes have a volcanic appearance we must remember that such an effect occurred in the past by the action of the lava.
How it will fit and some of their characteristics
The magma in the Earth's interior has gas and at the time of an eruption occurs an increase of the atmospheric pressure inside the volcano and due to this gas disappear, thus forming the lava. Volcanoes, volcanologists, experts have estimated that the temperature of the lava is located between 700 and 1200 degrees Celsius, something that explains its devastating effect. On cooling, the lava becomes igneous rocks such as granite or basalt, which are used for some elements of the construction (in many countries are used to pave the floor or on the roofs). At the moment in which the lava produced a mantle rank and fluid that is dispersed is called a lava flow which, in turn, can be linear type (for example, when there is a slope next to the volcano) or in the form of fissures (happens when lava is scattered by different holes and not by the cone of the volcano). In the latter case the so-called robes of lava are created. The effect of the lava on the nature sometimes creates the well-known lava tubes, which are volcanic tunnels-shaped caves and that may form a complex branching of tunnels in the interior of the Earth. The different effects of lava (the mentioned pipes, washes or even Lakes) do not exist only on Earth, since there are also volcanoes on planets such as the Moon or Mars. Astronomers have been able to observe that in some moons of the planet Jupiter, volcanic eruptions frequently occur and the lava that is generated has similar features to the terrestrial.