Explanation:

- The Great Himalayas are a result of the collision between the Indian and Eurasian tectonic plates.

- This collision led to the uplift of deeply buried materials.

- Granite is an igneous rock, which commonly forms the core of many mountain ranges due to its origin deep within the Earth's crust.

- Slate is a metamorphic rock, typically formed from shale and used in roofing and flooring. It is not primarily found at the core.

- Sandstone is a sedimentary rock and usually found in more surface-level formations.

- Limestone is also a sedimentary rock, often found in marine sedimentary environments and not commonly forming the core of mountain ranges.