Earth’s Interior: Heat, Tectonic Plates, Earthquakes, and Volcanoes
1. Why is the Earth’s Interior so Hot?
The Earth’s interior is hotter than the exterior because of the heat generated when the Earth was formed. The temperature in the inner core is hotter (above 6,000ºC) than the surface of the Sun. The temperature increases by about 25ºC for every kilometer in depth.
4,600 Million Years Ago
Giant meteorites continually collided with the Earth. The heat they contained made the Earth hotter.
4,000 Million Years Ago
As the Earth heated up, it expanded. Metal material
Read MoreRenewable Energy Sources: Geothermal, Wind, and Hydraulic Power
Geothermal Reservoirs
Hydrothermal Deposits
Hydrothermal deposits contain fluid, primarily water, within the Earth. This water originates from surface sources like rain, snowmelt, and rivers, seeping into the ground through various cracks and fissures. Depending on the pressure (P) and temperature (T) within the reservoir, the water can exist in either gaseous or liquid form.
The surface of a hydrothermal deposit typically consists of:
- A heat source (e.g., magma)
- Impermeable rock surrounding the heat
Homo Sapiens Sapiens: Evolution, Origins, and Characteristics
Homo Sapiens Sapiens
Also known as Cro-Magnon, Homo sapiens sapiens is the direct ancestor of modern humans.
Homo sapiens sapiens is a subspecies of Homo sapiens, the only surviving species of the genus Homo and the hominid family. Therefore, their closest living relatives are the great apes (to which they belong), such as gorillas, chimpanzees, and orangutans.
Homo sapiens sapiens means “thinking man”.
Homo sapiens sapiens originated in Africa approximately 45,000 to 100,000 years ago and has since
Read MoreSpanish Landforms Glossary: A Guide to Iberian Relief
Alpine Orogeny
Tectonic movements at the beginning of the Tertiary period formed major mountain ranges like the Pyrenees and Betic Cordillera. These Alpine mountains are steep due to intense erosion from ice and snow. The Iberian range, also formed by this folding, has less dramatic relief.
Appalachian Relief
In areas like Sierra Morena, Montes de Toledo (Villuercas), and Montes de Leon (Sierra Cabrera), differential weathering levels soft rocks while hard rocks (mainly quartzite) form ridges or crests.
Read MoreWeather Elements in Spain: A Comprehensive Guide
Weather Elements in Spain
1. Cloud Cover and Insolation
Insolation is the amount of solar radiation received by the Earth’s surface. Due to its latitude, Spain receives over 2,000 hours of sunshine per year. However, there are significant contrasts between the Cantabrian coast, which receives less sunshine, and the southeastern peninsula and islands, which receive high insolation.
Cloudiness refers to the extent to which the sky is covered by clouds. The cloudiest area in Spain is the Cantabrian coast.
Read MoreDynamic Earth: A Journey Through Earth’s Systems
Theme 2: The Dynamic Earth
The Atmosphere
Earth is a planet characterized by active gases like methane and oxygen, which react rapidly. This dynamic atmosphere absorbs heat from the Earth’s surface, causing expansion.
Liquid Water on Earth
Why does liquid water exist on Earth’s surface?
- Gravity and Atmospheric Pressure: Earth’s gravity maintains atmospheric pressure, limiting evaporation.
- Greenhouse Gases: These gases prevent the hydrosphere from freezing.
Moving water erodes material from highlands to
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