photosynthesis
The composition of air depends upon altitude.
Burning fossil fuel releases carbon dioxide, a greenhouse gas which is building up in the atmosphere.
The process is called metamorphism, the alteration of chemical composition or structure due to heat and/or pressure.
A change of shape caused by folding is a physical change because the substance retains its chemical composition. Cutting, on the other hand, is also a physical change as it does not alter the chemical composition of the material.
a process that does not change the chemical composition of a substance. A change in a substance with no new substances being formed
No, erosion caused by wind is a physical change, not a chemical change. The wind is simply moving particles of rock or soil from one place to another without altering their chemical composition.
A tornado moves air and objects from one place to another and can tear apart buildings and trees. However, in all of this the chemical composition of everything hit by the tornado remains the same. Therefore all changes in this case are physical.
Melting is an example of a physical change because it does not change the chemical composition of the substance undergoing the change. Tarnishing, rusting, and burning are examples of chemical change because they are caused by chemical reactions, which change the chemical composition of the substances undergoing the change.
This process involve chemical reactions but also physical changes.
During a physical change, the composition of the materials remains the same. The change only affects the physical properties of the substance, such as its shape, size, or state of matter, without altering its chemical composition. This means that no new substances are formed during a physical change.
The chemical composition is changed during this process.
The process through which crystals change in size or composition is known as crystallization. This can occur through various mechanisms such as cooling, evaporation, or chemical reactions, leading to the formation of new crystals with different properties.