What term describes molten rock that has emerged above the Earth's surface?

• A. Magma
• B. Lava
• C. Igneous
• D. Basalt

Answer: (B)

Lava is the term used to describe molten rock that has emerged above the Earth's surface. When magma, which is molten rock found beneath the Earth's crust, rises and erupts out through volcanic activity, it is called lava. This transition from magma to lava occurs due to the decrease in pressure and temperature as the molten rock makes its way to the surface. Once exposed to the atmosphere, lava can flow or solidify into various forms, contributing to the formation of geological features such as volcanoes and lava fields. Understanding this distinction between magma and lava is essential in geology, as it highlights the processes involved in volcanic eruptions and the characteristics of volcanic rock.