Winds
Gujarat Board · Class 11 · Geography
Flashcards for Winds — Gujarat Board Class 11 Geography. Quick Q&A cards covering key concepts, definitions, and formulas.
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What is atmospheric pressure and what causes it?
Answer
Atmospheric pressure is the pressure exerted by the weight of air in the atmosphere on the earth's surface. It is caused by Earth's gravitational force acting on the air molecules. The standard atmosp…
How does altitude affect atmospheric pressure? What is the rate of decrease?
Answer
As altitude increases, atmospheric pressure decreases because air becomes thinner at higher altitudes. The pressure decreases by 1 cm or 13.32 millibars for every 165 metres of height gained. This is …
List the seven pressure belts on Earth from North to South.
Answer
1. North Polar High Pressure Belt (80°N-90°N) 2. North Sub-Polar Low Pressure Belt (60°N-70°N) 3. North Tropical High Pressure Belt (20°N-30°N) 4. Equatorial Low Pressure Belt (5°N-5°S) 5. South Tropi…
Why does the Equatorial Low Pressure Belt form and what is it also called?
Answer
The Equatorial Low Pressure Belt forms because: 1. Sun's rays fall vertically, causing high temperatures 2. Warm air expands, becomes light and rises 3. High humidity reduces air density It is also ca…
What is wind and how does it differ from air current?
Answer
Wind is air that moves horizontally from high pressure areas to low pressure areas. Air current is air that moves vertically (upward or downward). The direction and velocity of wind depend on the pres…
State Ferrell's Law and its effects on wind direction.
Answer
Ferrell's Law states that winds are deflected due to Coriolis force: - In Northern Hemisphere: winds deflect to their RIGHT - In Southern Hemisphere: winds deflect to their LEFT This deflection is cau…
What are Trade Winds and why are they called so?
Answer
Trade Winds are permanent winds that blow from Tropical High Pressure belts toward the Equatorial Low Pressure belt. They are called 'Trade Winds' because they blow steadily in the same direction with…
Describe Westerlies and their regional names in the Southern Hemisphere.
Answer
Westerlies blow from Tropical High Pressure belts toward Sub-Polar Low Pressure belts. In the Southern Hemisphere, they have special names due to their intensity: - Roaring Forties (40°S) - very stron…
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