The Properties of Sea Water
Maharashtra Board · Class 9 · Geography
Flashcards for The Properties of Sea Water — Maharashtra Board Class 9 Geography. Quick Q&A cards covering key concepts, definitions, and formulas.
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What is the average surface temperature of seawater in equatorial areas?
Answer
The average surface temperature of seawater in equatorial areas is around 25°C. This is the highest compared to mid-latitudes (16°C) and polar areas (2°C).
How does seawater temperature change with depth?
Answer
Seawater temperature decreases with depth up to 2000 meters. After 2000m, the temperature remains uniform at around 4°C everywhere from equatorial to polar regions. This happens because sunlight penet…
What factors affect the surface temperature of seawater?
Answer
Surface temperature is affected by: latitude (decreases from equator to poles), cyclones, rainfall, sea waves, ocean currents, salinity, pollution, convectional currents, and seasons. Ocean currents h…
Define salinity of seawater and how is it measured?
Answer
Salinity is the weight of all dissolved salts in water expressed as parts per thousand (‰). For example, if 1000g of seawater contains 40g of dissolved salts, the salinity is 40‰. It is measured using…
Why do seas with high evaporation rates have higher salinity?
Answer
When evaporation occurs, water turns into vapor and escapes, but salt remains in the remaining water. This concentrates the salt content, increasing salinity. Areas with high evaporation and low fresh…
Compare the salinity of tropical zones (25°-35° N and S) with equatorial regions.
Answer
Tropical zones have higher salinity than equatorial regions. In tropics: less rainfall, low river water supply, hot deserts nearby. In equatorial regions: daily convectional rainfall, large rivers lik…
Why is salinity low in polar regions?
Answer
Polar regions have low salinity because: 1) Very low temperatures reduce evaporation, 2) Melting snow and ice provide freshwater supply, 3) Low solar radiation means less water loss through evaporatio…
What is the Dead Sea and why is it called 'dead'?
Answer
The Dead Sea (Israel-Jordan border) has extremely high salinity of 332‰ (normal ocean is 35‰). Called 'dead' because no life exists except few unicellular organisms. Fish from River Jordan die immedia…
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