What type of rock is formed in the part of the rock cycle labeled A?

Lava is the molten rock that erupts from volcanoes and cools to form igneous rock. When lava reaches the Earth's surface and solidifies, it creates igneous rock through processes such as cooling and crystallization. This process is fundamental to the rock cycle, as igneous rocks can then be weathered and eroded to contribute to the formation of sedimentary rocks, or they may be subjected to heat and pressure to transform into metamorphic rocks. Understanding this process highlights the continuous nature of the rock cycle, where igneous rocks play a crucial role in creating new material in the geological landscape.