QUESTIONS: How Volcanoes Erupt 1. When do volcanic eruptions occur? 2. What is expelled when a volcano erupts? 3. In what layer of the Earth will you find magma? 4. Why does magma tend to move up towards the Earth's surface?

1. Volcanic eruptions occur when there is an increase in pressure within the Earth's crust due to the movement of molten rock, or magma, towards the surface. This can happen due to various reasons such as tectonic plate movements, volcanic activity, or human activities like mining or drilling.<br /><br />2. When a volcano erupts, it expels a variety of materials including lava, ash, and gases. Lava is the molten rock that flows out of the volcano, ash is the solid particles that are thrown into the air, and gases include water vapor, carbon dioxide, and sulfur dioxide.<br /><br />3. Magma can be found beneath the Earth's surface, specifically in the Earth's mantle. The mantle is the layer of the Earth located between the crust and the core, and it is where most of the Earth's magma is located.<br /><br />4. Magma tends to move up towards the Earth's surface due to its lower density compared to the surrounding solid rock. As magma rises, it can cause an increase in pressure within the Earth's crust, leading to volcanic eruptions.