Question

Ребята, срочно! Вопрос в домашней работе. 6 класс как образуются острова? кроме тех которые произошли от извержения вулканов​

Answer 1

Ответ:

Острова могут образовываться, как правило, двумя способами:

вследствии поднятия со дна океана после извержения вулкана или другой активности земной коры. Такие острова называют океаническими. Пример - Гавайские острова

острова, когда-то связанные с материком или ещё связанные, но разъединённые проливом. Их называют материковыми или контенинтальными. Пример - Япония, Великобритания

Answer 2

How Islands Form (excluding volcanic eruptions)

Islands can form through various geological processes, not just volcanic eruptions. Here are some of the ways islands can be formed:

1. Tectonic Activity: Islands can form as a result of tectonic activity, such as the movement of tectonic plates. When two plates collide, one plate may be forced beneath the other, creating a subduction zone. This can lead to the formation of volcanic arcs and chains of islands, known as island arcs. An example of this is the Japanese archipelago, which was formed by the subduction of the Pacific Plate beneath the Eurasian Plate.

2. Coral Reefs: Coral reefs are formed by the accumulation of coral skeletons over thousands of years. Over time, these coral reefs can grow large enough to emerge from the water and form islands. These types of islands are called coral islands or atolls. The Maldives in the Indian Ocean is an example of a group of islands formed by coral reefs.

3. Erosion and Deposition: Islands can also form through erosion and deposition processes. For example, when sediment is carried by rivers and deposited at the mouth of the river or along the coastline, it can accumulate and form islands. These types of islands are known as deltaic islands. The Mississippi River Delta in the United States is an example of a deltaic island.

4. Glacial Activity: During periods of glaciation, glaciers can carve out valleys and basins. When the glaciers retreat, these basins can fill with water, forming lakes. If the lake is surrounded by higher land, it can become an island. This process is known as glacial isostatic rebound. The Thousand Islands in the St. Lawrence River between the United States and Canada are an example of islands formed by glacial activity.

5. Landslides and Submarine Volcanoes: Landslides and underwater volcanic activity can also contribute to the formation of islands. When a landslide occurs underwater, it can displace water and create a wave that deposits sediment, forming an island. Submarine volcanoes can also erupt and build up enough material to form islands. Surtsey, an island off the coast of Iceland, was formed by a submarine volcanic eruption in 1963.

It's important to note that these are just a few examples of how islands can form. The specific processes involved can vary depending on the geological context and location.