Climate, Weather, and Geography

Antarctica is covered by approximately 98% thick ice, with only small areas of exposed rocky land, primarily along the coast and mountain peaks. This makes it mainly ice-covered, contradicting the notion that it has significant exposed land. The ice sheet averages over 2 kilometers in thickness and contains about 90% of the world's fresh water.

Fossil evidence (ferns, dinosaurs) proves Antarctica was tropical near the equator before continental drift moved it to the pole. It only began freezing ~34 million years ago. It was NEVER 'hot during summers' (D is nonsensical for a polar continent) and ice coverage is relatively recent in geological time.

When glacial ice becomes very dense through compression, it often appears blue. This occurs because the dense ice crystals absorb longer wavelengths of light (red, orange) while scattering blue light more effectively.

Hurricanes are classified by their sustained wind speeds, with major hurricanes capable of exceeding 160 miles per hour. The Saffir-Simpson Hurricane Wind Scale rates hurricanes from Category 1 (74-95 mph) to Category 5 (157+ mph), meaning the strongest hurricanes can indeed pack wind speeds over 160 mph.

Due to the Coriolis effect caused by Earth's rotation, hurricanes in the Northern Hemisphere rotate counter-clockwise around their eye. This is a fundamental characteristic of tropical cyclones north of the equator. In the Southern Hemisphere, they rotate clockwise for the same reason.

Category 1 hurricanes on the Saffir-Simpson Hurricane Wind Scale have sustained wind speeds of 74-95 mph (119-153 km/h). These storms can produce dangerous winds that cause some damage to roofs, shingles, and gutters, along with extensive tree damage and power outages.

Category 3 hurricanes on the Saffir-Simpson Hurricane Wind Scale have sustained wind speeds of 111-129 mph (178-208 km/h). These are considered major hurricanes capable of causing devastating damage, including structural damage to buildings, uprooting of trees, and near-total power loss.

Tropics are the geographic regions on or near the Earth's equator, specifically between the Tropic of Cancer and the Tropic of Capricorn. These regions are characterized by warm temperatures throughout the year and receive direct sunlight more consistently than regions at higher latitudes. They are not near the poles, hill stations, or specifically deserts.

Glacial ice appears blue because of how ice crystals compress and become denser over many years. As snow accumulates and compresses into ice, air bubbles are forced out and ice crystals grow larger. This dense ice absorbs longer wavelengths (red) and reflects shorter wavelengths (blue), similar to why deep water appears blue. The process takes decades to centuries, producing the characteristic blue color of ancient glacial ice.

Glaciers are classified into two main types based on their size and location: alpine glaciers (also called mountain or valley glaciers) that form in mountainous areas, and ice sheets (continental glaciers) that cover vast areas of land. Option A is incorrect because icebergs are floating ice chunks, not glaciers. Option C describes water types, not glacier types. Option D is not a valid classification.

An isohyet is a line on a map connecting points that receive equal amounts of rainfall. Isohyets are used to visualize precipitation patterns and create rainfall maps. Temperature is shown by isotherms, pollution has no standard isoline name, and "dust" is not what isohyets measure.

A shrinking temperature-dewpoint spread indicates the air is approaching saturation. When this spread becomes small and continues decreasing, the air temperature will soon reach the dewpoint, causing water vapor to condense. At 62°F, this typically results in radiation fog or low stratus clouds, not thunderstorms or freezing precipitation which require different conditions.

Anil is a Sanskrit name meaning 'wind' or 'air' (from 'anila'). Fire, water, and sky are other elements with different Sanskrit names (agni, jal/jaldev, aakaash).

Clouds are primarily composed of water in the form of tiny water droplets or ice crystals. Water vapor condenses around particles to form clouds.

High clouds including cirrus clouds are found in the troposphere which extends up to about 12km. All weather phenomena occur in the troposphere.