What does it mean to be less/more dense

Dense is basically a term in   which we refer to as "density" density is often referred to as mainly involving liquids , solids , woods and other materials it is used to measure the close compacted materials such as in oats to measure how they float and how many cubics it may carry so less or more may be a     {result of weather the specific object is heavy/light}

Wetlands form where water and land meet. a lake with a wetland fringe can fill in with decayed plant and animal material to become a wet meadow. a pond can fill in to become a bog or fen. sediment can fill in a river marsh to become a swamp.flooding of coastal lowlands from rising sea levels has created broad coastal marshes that are protected from wave action by barrier islands or reefs. coastal wetlands also form when rivers deposit sediment as they reach the ocean. plants then take root and hold the soil firm against the forces of tides and waves.