The underlying rock in Goa is predominantly:

Granite
Basalt
Limestone
Sandstone

The underlying rock in Goa is predominantly basalt. Basalt is a dark, fine-grained igneous rock that is formed when lava cools and solidifies on the Earth’s surface. It is the most common type of igneous rock in the world, and it is found in many different parts of the globe, including Goa. Basalt is a very hard rock, and it is often used in construction and other applications where strength is required.

Granite is a coarse-grained igneous rock that is formed when magma cools and solidifies deep within the Earth’s crust. It is composed of quartz, feldspar, and mica, and it is often used in construction and other applications where strength and durability are required.

Limestone is a sedimentary rock that is formed from the accumulation of calcium carbonate. It is often found in marine environments, and it is used in a variety of applications, including construction, agriculture, and manufacturing.

Sandstone is a sedimentary rock that is formed from the accumulation of sand-sized grains of quartz. It is often found in desert environments, and it is used in a variety of applications, including construction, landscaping, and glassmaking.

In conclusion, the underlying rock in Goa is predominantly basalt. Basalt is a dark, fine-grained igneous rock that is formed when lava cools and solidifies on the Earth’s surface. It is the most common type of igneous rock in the world, and it is found in many different parts of the globe, including Goa. Basalt is a very hard rock, and it is often used in construction and other applications where strength is required.