Which of the following is primarily found at high temperatures and high pressures?

The presence of supercritical fluids at high temperatures and high pressures is a defining characteristic that sets them apart from other states of matter. In the supercritical state, a substance exhibits properties of both gases and liquids. This occurs when a substance is heated above its critical temperature and pressurized beyond its critical pressure, allowing it to diffuse through solids like a gas while dissolving materials like a liquid.

Metamorphic rocks, while they do form under conditions of high pressure and temperature, are the result of the alteration of existing rocks rather than being a state of matter themselves. They undergo physical and chemical changes but do not exist in a supercritical state.

Igneous rocks are formed from the solidification of molten materials (magma or lava) and generally form at varying temperatures and pressures, depending on their location within the Earth's crust or surface. This process does not inherently involve the high-pressure and high-temperature conditions associated with supercritical fluids.

Liquid water exists at a wide range of temperatures and pressures, but it does not reach the supercritical phase unless subjected to specific high-temperature and high-pressure conditions. This implies that while water can exist under such conditions, it is not primarily characterized by them in the way that supercritical fluids are.

Thus, supercritical