That depends what exactly is in the "dirt" .
a gollon
An ounce is about 28 times heavier than a gram.
yes
Yes 1 kilogram = 35.27 ounces 1 ounce = 0.02 kilogram
A lot of things are denser than water. It depends on how much water you are using.
The egg is heaver per volume than the water.
Either: its heaver than water, or if its a boat, then water go in.
Rocks are denser than dirt, and dirt is denser than water
Yes a football is heaver than a soccer ball.
We float or there is a possibility you can sink. You sink when you are heaver than the mass of the water. You float when you are lighter than the mass of the water.
no
A fluid ounce of water weighs slightly more than a dry ounce (1 fluid ounce of water weighs 1.043 dry ounces). Therefore a fluid ounce of water is heavier than a dry ounce of flour (or anything else for that matter). Note that a fluid ounce of something else might NOT be heavier. A fluid ounce of lead is much heavier than a fluid ounce of feathers!