On earth, water can exist as a solid, a liquid, or a gas. why? a. earth is at an ideal temperature due to its distance from the sun. b. earth rotates counterclockwise as viewed from above the north pole. c. earth is shaped like a sphere and revolves around the sun. d. the moon takes about 27 days to revolve around earth.

Water exists in three distinct phases at something called the triple point. ... At this temperature water is in the process of changing from a solid state into the liquid phase or visa versa. Molecules in the liquid phase can loose a bit of energy and solidify whilst solid water (ice) can gain some energy and melt.

The correct option is a. Earth is at an ideal temperature due to its distance from the Sun.

Water can exist in three different states i.e. solid, liquid and gas at a particular temperature of 273.16 K and pressure of 611.2 Pa and this stage is known is triple point of water.

At this temperature and pressure the water continues to change from solid phase to the liquid phase and vice-versa. Water is generally found in liquid form but at 32°F it gets frozen as ice which is the solid form and at 212°F it starts boiling and some part of water gets turned into steam which is the gaseous form. Steam on contact with cool air can condense back to liquid water and further to ice. So the water can keep changing its state and can be found in all three states on Earth as the temperature and pressure conditions found on Earth are favorable for water to co-exist in all its three states.

Also water is a compound and not an element and the conditions at or near the Earth surface which is approximately 25°C and 1 bar pressure allows the water to remain at all the three states at its triple point.

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