they sink
Objects sink in water because they are denser than water, not necessarily because they are heavier.
Objects which are less dense than water will float. Objects denser than water will float or sink depending on the volume of water that they displace and that will depend on their shape.
More physics than chemistry, really. Salt makes the water denser, allowing denser objects to float, than in pure water.
Objects that are denser than water will sink in water. This includes materials like metal, glass, and some types of plastic.
Because some objects are a lot denser than water so the sink and others are less denser so they float
Objects that are denser than water or have spaces that allow water to fill in quickly would sink in water. Materials like lead, iron, and rocks are denser than water and will sink. Objects like wood or plastic may float depending on their density.
The density of water is 1000 gr cm-3 and the density of the Earth is about 5400 gr cm-3. So it's denser.
because some objects are much denser(heavier) than water so they sink
An object will float if it is less dense than the water (or other liquid). If it is denser than the water, it sinks.
Objects that are denser than water will sink, such as rocks, metal objects, and certain types of wood. Objects that are less dense than water will float, such as plastic bottles, rubber ducks, and foam.
Atoms cause the objects to be denser when they are more compact it's denser and more spread out it's not denser
Particles do make objects denser than they normally may be. For example, if you add particles of salt to water, the water will become more dense. Alternately, if you filter impurities out of water it will become less dense.