Ocean Deposits — Flashcards

Answer

Ocean deposits, also known as marine sediments, are materials that settle at the bottom of oceans. These include rocks, sand, mud, organic remains, and volcanic ash. They originate from land, oceans, …

Answer

Ocean deposits are important because: 1) They help reconstruct Earth's geological and climate history. 2) They contain fossils that reveal evolution of marine life. 3) They host valuable resources lik…

Answer

The major sources are: 1) Terrigenous (from land), 2) Volcanic, 3) Marine organisms, 4) Inorganic precipitation, 5) Chemical transformation, 6) Extraterrestrial (meteorites), and 7) Human waste. Each …

Answer

Terrigenous deposits are sediments derived from land and transported to the ocean by rivers, winds, and glaciers. They include materials like sand, silt, clay, and gravel. These are mostly found on co…

Answer

Rivers carry large amounts of weathered rock material, soil, and dissolved minerals from land into the sea. About 15,000 to 20,000 million tonnes of terrigenous sediments are added to oceans annually.

Answer

Volcanic eruptions release ash, dust, and rock fragments into the air or directly into the sea. Subaerial volcanoes eject material that may be carried by wind over oceans. Submarine volcanoes release …

Answer

Dead marine organisms like plankton, foraminifera, and diatoms sink to the ocean floor after death. Their hard shells made of calcium carbonate or silica accumulate as organic sediments. In deep ocean…

Answer

Inorganic precipitation occurs when dissolved minerals in seawater exceed their solubility and form solid deposits. This can happen due to evaporation, temperature changes, or chemical reactions. For …