Continents and Oceans — Flashcards
Gujarat Board · Class 11 · Geography
20 flashcards for Continents and Oceans (Gujarat Board Class 11 Geography) to test yourself on key terms and facts.
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What are landforms and how are they classified into orders?
Answer
Landforms are distinct surface features of Earth that differ in shape, rock structure, height, slope, etc. They are classified into: 1. First order: Continents and ocean basins (formed first after Ear…
What is the percentage distribution of land and water on Earth's surface?
Answer
Total Earth's surface area: 50.68 crore square km - Hydrosphere (seas and oceans): 36.60 crore square km (71%) - Continents: 14.08 crore square km (29%) The hydrosphere dominates Earth's surface area.
Why is the Northern Hemisphere called the 'Land Hemisphere' and Southern Hemisphere the 'Water Hemisphere'?
Answer
Northern Hemisphere (Land Hemisphere): Contains about 81% of Earth's total land area, including North America, Europe, Asia, and parts of Africa and South America. Southern Hemisphere (Water Hemisphe…
What was Pangaea according to Wegener's Continental Drift Theory?
Answer
Pangaea (German word meaning 'primitive continent') was the single supercontinent that existed about 200 million years ago according to Wegener. It consisted of: - Laurasia (northern part): Present-da…
Who proposed the Continental Drift Theory and when?
Answer
Alfred Wegener, a German meteorologist and geophysicist, proposed the Continental Drift Theory in 1912. The theory was originally written in German and became popular after its English translation in …
What evidence did Wegener provide to support his Continental Drift Theory?
Answer
Wegener's evidence included: 1. Jig-saw fit: Coastal shapes of continents fit together (e.g., South America and western Africa) 2. Geological evidence: Similar rock formations across oceans (Brazilian…
What are tectonic plates and how are they classified?
Answer
Tectonic plates are rigid landmasses that include continents, ocean floors, and the asthenosphere above the mantle. They are classified as: Major Plates (7): North American, South American, Pacific, …
Define Divergent and Convergent plates with examples.
Answer
Divergent Plates: Two plates moving in opposite directions away from each other. They create new oceanic crust at mid-ocean ridges through sea-floor spreading. Convergent Plates: Two plates moving to…
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