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Approximately 71% of Earth's surface is covered by saline water bodies.
Seas and oceans play a critical role in regulating global climate patterns and weather systems.
They are vital for supporting diverse marine biodiversity and complex ecosystems.
Over 90% of international trade relies on maritime routes, highlighting their economic importance.
An 'ocean' is generally defined as a vast, continuous body of saline water that covers a significant portion of the Earth's surface, typically separated by continents. A 'sea,' on the other hand, is a smaller body of saline water, usually partially enclosed by land or connected to an ocean. Seas can be categorized as marginal (part of an ocean, e.g., Arabian Sea), inland (largely enclosed by land, e.g., Caspian Sea), or epicontinental (shallow, over a continental shelf, e.g., North Sea).
Simple Analogy: Think of an ocean as a large, open highway connecting continents, while a sea is like a smaller road or bay branching off that highway, often leading to specific regions or being partially enclosed.
Ocean warming, acidification (due to increased CO2 absorption), and sea-level rise are direct consequences of climate change with profound global impacts on marine ecosystems and coastal communities.
Issues like plastic waste, oil spills, and chemical runoff pose severe threats to marine biodiversity, food chains, and human health, necessitating international cooperation for mitigation.
Conventions like UNCLOS (United Nations Convention on the Law of the Sea) govern maritime activities, territorial waters, exclusive economic zones (EEZs), and the use of ocean resources, impacting geopolitics and trade.
Sustainable management of fisheries and aquaculture is crucial for providing protein and livelihoods to billions worldwide, directly linking to global food security.
GS Paper I: Physical Geography (Oceanography, Climate, World Geography); GS Paper III: Environment & Ecology (Marine Ecosystems, Pollution, Climate Change).
General Awareness: World Geography, Basic Science (Environment).
General Awareness: Basic Geography, Environmental Issues.
General Awareness: World Geography, Environmental Science.
General Knowledge: Geography, Environmental Studies.
With reference to the water on the planet Earth, consider the following statements: 1. The amount of water in the rivers and lakes is more than the amount of groundwater. 2. The amount of water in polar ice caps and glaciers is more than the amount of groundwater. Which of the statements given above is/are correct?
Answer: 2 only
Which of the following is/are the advantage/advantages of practising drip irrigation? 1. Reduction in weed 2. Reduction in soil salinity 3. Reduction in soil erosion Select the correct answer using the code given below.
Answer: 1 and 3 only
What are the benefits of implementing the Integrated Watershed Development Programme? 1. Prevention of soil runoff 2. Linking the country's perennial rivers with seasonal rivers 3. Rainwater harvesting and recharge of groundwater table 4. Regeneration of natural vegetation Select the correct answer using the code given below.
Answer: 1, 3 and 4 only
This topic is regularly tested in the geography and environment sections of various competitive examinations, especially UPSC CSE.
The branch of science that deals with the physical and biological properties and phenomena of the sea.
Complex communities of organisms interacting with their physical and chemical environment in the ocean.
The measure of the amount of dissolved salts in a body of water.
A natural or artificial reservoir that accumulates and stores some carbon-containing chemical compound for an indefinite period.
United Nations Convention on the Law of the Sea, an international agreement that establishes a legal framework for all marine and maritime activities.