grass
grass
Grass
Blacktop is asphalt. There would be no difference.
Salt water boils more rapidly then unsalted water.
Adding warm water will expand yeast cells rapidly
If you are positive that it is asphalt I would not suggest adhering tile directly to the asphalt. If removal of asphalt is not an option I would install a subfloor and use thinset mortar to adhere the tile. Another option (probably the better option) would be to pour a concrete mix over the asphalt. Than use thinset to install the tile. The concrete will incapsolate the asphalt. Asphalt more than likely has oils in it and can be a hazard.
The object would float in the middle if it was in water.
the object would float on top of the water so the water level would change because of the heavy object
It would float in water.
If an object was less denser than water it would float
Water would move through sand more rapidly than silt, but that does not mean sand would erode more rapidly than silt. In fact, the opposite is true. Erosion occurs when water runs along the surface of the land. If it infiltrates downward into the soil, it does not create runoff.
It would sink because the object is more dense than the water.