evaporation
evaporation
evaporation
As the water is poured into the glass, some oxygen dissolves in it. If the water doesn't move, the oxygen slowly diffuses out of it. If you were to pour in the water in a vacuum and then removed the vacuum and left the water stagnant, there would be no oxygen content decrease.
The amount of water in the glass is equivalent to the amount of water not in the glass.
If the glass of water is left on the table over many days, the mass of the water will remain the same as the amount of water does not change. However, the weight of the glass of water may decrease slightly due to evaporation of the water, depending on environmental conditions like temperature and humidity.
The water level in the glass probably looked lower than before the rolled paper towel was put in. If the amount of water was small and the paper towel was big enough, the water level could decrease or even be absorbed completely.
The amount of water in the ocean temporary decrease.
It's NOT "A" B: A decrease in the amount of organic matter.
The water level in a toilet bowl drops slowly because there may be a clog or blockage in the pipes, preventing water from flowing freely. This can cause the water to drain slowly, leading to a gradual decrease in the water level.
evaporation, transpiration and it could also be stored in a dam or pond, or it gets absorbed by the earth.
Simple. get a glass container of some type fill it with water and slowly pour it slowly but steadily into somewhere e.g. the sink.
When careless human activities decrease the amount of plant life, the amount of runoff usually increases. Without sufficient vegetation to absorb water, runoff carries more pollutants and sediment into water bodies, leading to water pollution and sedimentation, which can harm aquatic ecosystems.