No, but pumice can.
The type of rock that comprises the bulk of the continents is called granite. Granite is an igneous rock that is formed from the slow cooling of magma beneath the Earth's surface. It is a common rock found in continental crust.
Granite rock is denser than water, so it will sink when placed in water.
Pumice is an example of this
Pumice has tiny air pockets to help it float in water.
No, granite is usually heavier than limestone. Granite is a denser and more compact rock, composed mainly of quartz, feldspar, and mica, while limestone is a sedimentary rock primarily made of calcite.
No, obsidian rock does not float as it is a dense and heavy igneous rock formed from cooled lava. Its high density causes it to sink in water.
Pumice floats in water, but for other rocks you'd need to find a fluid that's more dense than the rocks to float them in. For example, mercury is almost 6 times as dense as granite, so a lump or slab of granite will ride right up there high in a pool of mercury.
The Earth's tectonic plates are primarily made of solid rock, composed mostly of silicate minerals such as feldspar and quartz. These plates are rigid sections of the Earth's lithosphere that float on the semi-fluid asthenosphere beneath them.
Most igneous rocks are denser than water, so they do not float. However, some types of igneous rocks, such as pumice, can contain trapped air bubbles which make them less dense than water, causing them to float.
The float could be stuck because of stuck needle valve, or rust. The float could also be leaking and be full of fuel.
Burn the wood chips. Alternatively, shake them around for a little while, the granite is heavier and would settle to the bottom, so you could remove the wood from the top, this isn't 100% effective, but it's more effective than setting it on fire. This can be accomplished by shoveling the mixture into water (a wheelbarrow, a buck, some other large container). The chips float and can be skimmed off. The granite sinks and can be shoveled out later.
No, pumice, a frothy lava containing pockets of air or gasses, is often very light and will float on water.