Final answer:
The extreme viscosity of lava does not create high pressure. Pressure in a volcano is caused by the buildup of gases within the magma chamber.
Step-by-step explanation:
False. The extreme viscosity of lava does not create high pressure. Instead, the pressure in a volcano is caused by the buildup of gases within the magma chamber. As hot rock deep within the earth begins to melt, it forms a liquid called magma. The pressure inside the volcano builds up as gas bubbles form and become trapped in the magma, creating a high-pressure environment that can lead to an explosive eruption.