Tide clocks are popular clocks used amongst surfers, sailors, and anyone else who is concerned with the tidal cycle. They run on a 12 hour and 25 or 26 minute cycle, which is the time it takes for the high tide to ebb and flow back to high tide again.

Correct Option: B

Tide clocks are popular clocks used amongst surfers, sailors, and anyone else who is concerned with the tidal cycle. They run on a 12 hour and 25 or 26 minute cycle, which is the time it takes for the high tide to ebb and flow back to high tide again.

The troposphere is the lowest layer of Earth’s atmosphere. It starts at Earth’s surface and goes up to a height of 7 to 20 km above sea level. Most of the mass (about 75-80%) of the atmosphere is in the troposphere. Almost all weather occurs within this layer.

Correct Option: C

The troposphere is the lowest layer of Earth’s atmosphere. It starts at Earth’s surface and goes up to a height of 7 to 20 km above sea level. Most of the mass (about 75-80%) of the atmosphere is in the troposphere. Almost all weather occurs within this layer.

Ozone in the Earth's stratosphere is created by ultraviolet light striking ordinary oxygen molecules containing two oxygen atoms (O₂ ), splitting them into individual oxygen atoms (atomic oxygen). The atomic oxygen then combines with unbroken O₂ to create ozone (O₃ ). The ozone molecule is unstable and when ultraviolet light hits ozone it splits into a molecule of O2 and an individual atom of oxygen, a continuing process called the ozone-oxygen cycle. Chemically, this can be described as:
O₂ + nuv → 2O O + O₂ ↔ O₃

Correct Option: A

Ozone in the Earth's stratosphere is created by ultraviolet light striking ordinary oxygen molecules containing two oxygen atoms (O₂ ), splitting them into individual oxygen atoms (atomic oxygen). The atomic oxygen then combines with unbroken O₂ to create ozone (O₃ ). The ozone molecule is unstable and when ultraviolet light hits ozone it splits into a molecule of O2 and an individual atom of oxygen, a continuing process called the ozone-oxygen cycle. Chemically, this can be described as:
O₂ + nuv → 2O O + O₂ ↔ O₃

Most commonly, rain clouds that produce a steady rain are referred to as nimbostratus clouds. These clouds appear low in the sky and are a medium to dark gray color. Besides, cumulonimbus clouds produce rain, hail and other attributes of thunderstorms. These clouds begin as cumulus clouds that achieve vertical growth.

Correct Option: B

Most commonly, rain clouds that produce a steady rain are referred to as nimbostratus clouds. These clouds appear low in the sky and are a medium to dark gray color. Besides, cumulonimbus clouds produce rain, hail and other attributes of thunderstorms. These clouds begin as cumulus clouds that achieve vertical growth.

Sleet is precipitation composed of rain and partially melted snow. It forms when rain, while falling to the earth, passes through a layer of cold air and freezes. Sleet occurs when the temperature in the lowest part of the atmosphere is slightly above the freezing point of water (0 °C).

Correct Option: C

Sleet is precipitation composed of rain and partially melted snow. It forms when rain, while falling to the earth, passes through a layer of cold air and freezes. Sleet occurs when the temperature in the lowest part of the atmosphere is slightly above the freezing point of water (0 °C).