Teide in the context of "Mount Etna"

Geologically, a volcanic island is an island of volcanic origin. The term high island can be used to distinguish such islands from low islands, which are formed from sedimentation or the uplifting of coral reefs (which have often formed on sunken volcanoes).

Pumice ( /ˈpʌmɪs/), called pumicite in its powdered or dust form, is a volcanic rock that consists of extremely vesicular rough-textured volcanic glass, which may or may not contain crystals. It is typically light-colored. Scoria is another vesicular volcanic rock that differs from pumice in having larger vesicles, thicker vesicle walls, and being dark colored and denser.

Pumice is created when super-heated, highly pressurized rock is rapidly ejected from a volcano. The unusual foamy configuration of pumice happens because of simultaneous rapid cooling and rapid depressurization. The depressurization creates bubbles by lowering the solubility of gases (including water and CO₂) that are dissolved in the lava, causing the gases to rapidly exsolve (like the bubbles of CO₂ that appear when a carbonated drink is opened). The simultaneous cooling and depressurization freeze the bubbles in a matrix. Pumice is fragments of lava or tephra that cooled in air or water. If pumice from an underwater volcanic eruption reaches the water surface, it can form pumice rafts on the water surface that can be a hazard for ships.

La Palma (Spanish: [la ˈpalma] , locally [lɐ ˈpɑ(l)mɐ]), also known as La isla bonita (English: The Beautiful Island) and historically San Miguel de La Palma, is the most northwesterly island of the Canary Islands, a Spanish autonomous community and archipelago in Macaronesia in the North Atlantic Ocean. La Palma has an area of 708.32 square kilometres (273.48 sq mi) making it the fifth largest of the eight main Canary Islands. The total population at the start of 2023 was 84,338, of whom 15,522 lived in the capital, Santa Cruz de La Palma and 20,375 in Los Llanos de Aridane. Its highest mountain is the Roque de los Muchachos, at 2,426 metres (7,959 ft), being second among the peaks of the Canaries after the Teide massif on Tenerife.

In 1815, the German geologist Leopold von Buch visited the Canary Islands. It was as a result of his visit to Tenerife, where he visited the Las Cañadas caldera, and then later to La Palma, where he visited the Taburiente caldera, that the Spanish word for cauldron or large cooking pot – "caldera" – was introduced into the geological vocabulary. In the center of the island is the Caldera de Taburiente National Park, one of four national parks in the Canary Islands.

This is a list of Spanish mountains (with associated ranges) with their elevation taken from the Instituto Nacional de Estadística de España data.Where available is also reported the mountains' prominence.

Province of Santa Cruz de Tenerife, also Province of Santa Cruz (Spanish: Provincia de Santa Cruz de Tenerife), is a province of Spain, consisting of the western part of the autonomous community of the Canary Islands. It consists of about half of the Atlantic archipelago: the islands of Tenerife, La Gomera, El Hierro, and La Palma. It occupies an area of 3,381 km (1,305 sq mi). It also includes a series of adjacent roques (those of Salmor, Fasnia, Bonanza, Garachico and Anaga).

Its capital is the city of Santa Cruz de Tenerife (commonly known as Santa Cruz), on the island of Tenerife (Spain's most populous island). At the start of 2023 the province had 1,067,173 inhabitants and a density of 315.6 /km, making it the province of Spain with the sixth highest population density, higher than that of the province of Las Palmas (the eastern half of the Canary Islands). 19.6% live in the capital, Santa Cruz de Tenerife, which is also the capital of the Autonomous Community of the Canary Islands. There are 54 municipalities in the province; see List of municipalities in Santa Cruz de Tenerife. Tenerife is the most populated island of the Canary Islands and most populous island of Spain. In addition, the island also has the highest altitude of Spain and all of the Atlantic Islands (Teide 3718 m).

Pico Viejo is a volcano located on the island of Tenerife in Canary Islands, Spain. It is the second highest peak of Tenerife and the Canary Islands (after Teide), with a summit height of 3,129 m above sea level, and a crater approximately 720 metres in diameter.

The volcano is part of the Teide volcanic complex, which began forming about 200,000 years ago in the center of Tenerife. Its crater is one of the satellite craters around Teide.

Synthetic-aperture radar (SAR) is a form of radar that is used to create two-dimensional images or three-dimensional reconstructions of objects, such as landscapes. SAR uses the motion of the radar antenna over a target region to provide finer spatial resolution than conventional stationary beam-scanning radars. SAR is typically mounted on a moving platform, such as an aircraft or spacecraft, and has its origins in an advanced form of side looking airborne radar (SLAR). The distance the SAR device travels over a target during the period when the target scene is illuminated creates the large synthetic antenna aperture (the size of the antenna). Typically, the larger the aperture, the higher the image resolution will be, regardless of whether the aperture is physical (a large antenna) or synthetic (a moving antenna) – this allows SAR to create high-resolution images with comparatively small physical antennas. For a fixed antenna size and orientation, objects which are further away remain illuminated longer – therefore SAR has the property of creating larger synthetic apertures for more distant objects, which results in a consistent spatial resolution over a range of viewing distances.

To create a SAR image, successive pulses of radio waves are transmitted to "illuminate" a target scene, and the echo of each pulse is received and recorded. The pulses are transmitted and the echoes received using a single beam-forming antenna, with wavelengths of a meter down to several millimeters. As the SAR device on board the aircraft or spacecraft moves, the antenna location relative to the target changes with time. Signal processing of the successive recorded radar echoes allows the combining of the recordings from these multiple antenna positions. This process forms the synthetic antenna aperture and allows the creation of higher-resolution images than would otherwise be possible with a given physical antenna.