The question asks about the general variation of water vapour content in the atmosphere with latitude. This relates to atmospheric temperature and the capacity of air to hold moisture.
Correct Option: B) It decreases from the equator towards the poles
The question asks about the important functions of water vapour in the atmosphere. We need to evaluate each option based on the known properties and roles of water vapour in Earth's climate system.
D) It acts like a blanket, preventing the Earth from becoming too cold or too hot.
Water vapour is the most abundant greenhouse gas in Earth's atmosphere. It absorbs infrared radiation emitted from the Earth's surface, re-radiating some of it back to the surface. This process is crucial for maintaining a habitable temperature range on Earth, preventing extreme temperature fluctuations. It acts like a thermal blanket, regulating the planet's temperature.
The question asks to identify which option is NOT a typical source of dust particles in the atmosphere. We need to evaluate each option based on its physical and chemical properties and its role in atmospheric composition.
Correct Option: A) Ozone molecules are gaseous and do not contribute to atmospheric dust particles. Dust particles are solid or liquid aerosols.
The question asks about the concentration of dust particles in the atmosphere. This requires knowledge of the atmospheric layers and the factors influencing the distribution of particulate matter.
Correct Option: D) The lower layers of the atmosphere
The question asks about the regions where dust particle concentration is generally higher compared to equatorial and polar regions. This relates to atmospheric circulation, climate patterns, and human activities.
C) Subtropical and temperate regions (due to dry winds) — This option correctly identifies the regions where higher dust concentrations are found. Subtropical regions are home to major deserts, which are primary sources of dust. Temperate regions also contribute due to dry conditions, agricultural practices, and industrial activities. Dry winds are a key mechanism for dust entrainment and transport.
The question asks about the role of dust and salt particles in cloud formation. Cloud formation is a process involving the condensation of water vapour. We need to identify the specific role these particles play in facilitating this condensation.
D) They act as hygroscopic nuclei around which water vapour condenses. This is the fundamental role of dust and salt particles in cloud formation. They provide the necessary surfaces for water vapour to condense, especially hygroscopic particles like salt that attract water.