Explain four intrusive volcanicity features and describe five conditions for hot springs and geysers.

8. a) Explain four (04) intrusive Volcanicity features. Batholiths: Large, irregular masses of intrusive igneous rock that form when magma cools and solidifies deep within the Earth's crust. They are typically composed of granite or granodiorite and are exposed at the surface after significant erosion of overlying rock. Laccoliths: Mushroom-shaped intrusions that form when viscous magma pushes up the overlying rock layers into a dome-like structure, while the base remains relatively flat. They are typically smaller than batholiths. Sills: Tabular intrusions of igneous rock that form when magma intrudes horizontally* between existing layers of sedimentary or metamorphic rock. They are parallel to the bedding planes of the surrounding rock. Dykes: Tabular intrusions of igneous rock that form when magma intrudes vertically* or at a steep angle across existing layers of rock. They cut through the bedding planes of the surrounding rock. b) Describe five (05) conditions necessary for the occurrence of Hot Spring and Geysers. Heat Source: A powerful and continuous source of heat, typically from a shallow magma chamber or hot igneous rocks close to the surface, is required to heat the groundwater. Water Supply: An abundant supply of groundwater is essential. This water percolates through cracks and fissures in the rock, where it is heated. Permeable Rock: The presence of permeable rock layers allows water to seep down to the heat source and then rise back to the surface. Conduit System: A system of fractures, cracks, and narrow conduits in the rock is necessary to allow the heated water and steam to rise rapidly to the surface, often under pressure. Pressure Build-up (for Geysers): For geysers specifically, a constricted plumbing system prevents the superheated water from boiling immediately. Pressure builds up until the water flashes to steam, erupting violently.