Hardness:

* Granite: Has a Mohs hardness of 6-7.

* Limestone: Has a Mohs hardness of 3-4.

Mohs Hardness Scale:

The Mohs Hardness Scale is a relative scale that measures the scratch resistance of minerals. A higher number indicates a harder mineral.

Explanation:

Limestone is primarily composed of calcium carbonate, which is a relatively soft mineral. Granite, on the other hand, is a igneous rock composed of quartz, feldspar, and mica, all of which are harder minerals.

Implications:

The difference in hardness has several implications:

* Durability: Granite is more durable and resistant to wear and tear than limestone.

* Carving: Limestone is easier to carve and sculpt than granite.

* Weathering: Limestone is more susceptible to weathering and erosion than granite.

In summary: Limestone is a softer rock than granite due to its composition and Mohs hardness rating. This difference in hardness affects their durability, carving ease, and resistance to weathering.