Everyday Science

The phases of the moon occur because of the moon's revolution around the Earth, which changes the portion of the moon illuminated by the sun as seen from Earth. This causes the visible shape of the moon to change over time.

Relative humidity is lowest when the air temperature is highest because warmer air can hold more moisture, so the same amount of moisture represents a lower relative humidity percentage. This typically occurs during the afternoon when temperatures peak.

Foot candle is a unit of illuminance (light intensity), not distance. Parsec, Astronomical Unit, and Light Year are all units used to measure distance, especially in astronomy.

An 'Elephant' paper size is a large sheet measuring 28 by 31 inches. Therefore, the correct dimension to complete the statement is 31 inches.

Evaporation (mixing) fog forms when warm rain falls into a colder layer of air near the surface, causing moisture to evaporate and mix with the cold air, leading to fog formation. This matches the description given in the question.

Abiotic components are non-living physical and chemical elements in the environment. Soil is an abiotic component, whereas plants, animals, and bacteria are living (biotic) components.

Asbestosis is a fatal degenerative lung disease caused by inhaling asbestos particles, leading to lung tissue scarring and impaired respiratory function. The other options do not relate to asbestos exposure.

Jupiter is the fastest rotating planet in the solar system, completing one rotation approximately every 10 hours, which is faster than Mercury, Mars, and Venus.

The blue color of the sky is primarily caused by Rayleigh scattering, where air molecules scatter shorter wavelengths of sunlight (blue light) more than longer wavelengths, making the sky appear blue to our eyes.

Among the options listed, Mercury is the smallest planet by diameter with about 4,880 km. Venus has a diameter of about 12,104 km, Mars about 6,792 km, and Pluto, although smaller at about 2,376 km, is classified as a dwarf planet, not a full planet. Therefore, Mercury is the smallest planet in the solar system by diameter among the given choices.