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It is possible, albeit a lot slower, to break up a rock using water. You would do this by freezing and thawing the water. You could create some initial holes or cracks in the rock, then pour water into the cracks or holes and allow them to freeze (so it's best to do this in winter or in colder climates). Since water expands when it freezes, this puts pressure on the inside of the rock and causes it to crack. You could continue to pour more water in and let it freeze to continue to break up the rock.

Drilling into brick or mortar requires the use of a masonry drill bit. Masonry drill bits appear similar to standard drill bits except for the leading tip of the bit. The tip has a bulky carbide arrow-shaped end slightly larger than the rest of the bit shaft. Standard or high-speed drill bits designed for making holes in wood or metal don’t have the ruggedness or design shape you need to drill into brick. They may not go through the brick at all, and if they do, they’re more likely to overheat, crack, or dull before you finish drilling.

A fireplace is, by definition, an enclosed space where you burn wood or other fuel for the purpose of generating light and heat. A firepit burns wood and is much less expensive to build, but they aren’t technically a fireplace as it isn’t enclosed. An outdoor oven—commonly outdoor brick pizza ovens—often uses wood as fuel, but its primary purpose is to cook food, and you’d rarely just burn wood inside them for warmth or aesthetic reasons.

Rock salt and ice melts contain sodium chloride, aka salt, and are corrosive to metal and concrete. If used frequently over time, it can cause corrosion, discoloration, chipping, and cracking to patios, walkways, and driveways. You can try a rock salt alternative or hire a professional snow removal company instead.