Correct answers is D.
Explanation:
Reaction most often happens between two chemicals. But it can also happen with only one chemical. Heating of water is also a reaction.
When we heat the water we bring thermal energy to it. This causes raise of temperature and water starts boiling. This creates water vapour. In this way the amount of water in liquid and gas states changes. This eliminates answers B and C.
Freezing of water is also a reaction. When the water freezes it increases it's volume. This eliminates answer A.
Velocity is speed in a specific direction and force is a push or pull that may cuase object to stop,move,or change direction they are always forces acting on it. so the different that in force there are always force acting on it
Answer:
During the fall in September, the Sun passes from northern hemisphere towards equator. ... On this day, Sunlight directly falls on the equator i.e. the sun crosses celestial equator. Day time is equal to night time in the two hemispheres
Explanation:
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