earth_science

Plate tectonics drives the formation of mountain ranges through processes including continental collision and orogenesis.

Earth's atmosphere is mostly transparent to visible light but absorbs much of the infrared and ultraviolet radiation from the Sun.

Sea ice extent in the Arctic has declined significantly since satellite records began in 1979.

Permafrost is ground that remains at or below 0 degrees Celsius for two or more consecutive years and underlies much of the Arctic.

The Pacific Ring of Fire is a region around the Pacific Ocean basin where many earthquakes and volcanic eruptions occur.

Continental drift was first proposed by Alfred Wegener in 1912, although a full mechanism had to await plate tectonics theory.

The El Nino-Southern Oscillation is a recurring climate pattern in the tropical Pacific affecting global weather.

The Anthropocene is a proposed geological epoch reflecting significant human impact on Earth's geology and ecosystems.

Ocean acidification is the ongoing decrease in pH of Earth's oceans caused by uptake of atmospheric carbon dioxide.

Glaciers calve icebergs when chunks break off into the ocean, a key process in sea level rise.

The Three Gorges Dam in China, completed in 2006, is the world's largest hydroelectric power station by installed capacity.

Renewable energy sources include solar, wind, hydroelectric, geothermal, and biomass.

The greenhouse effect is the warming of Earth's surface caused by atmospheric gases that absorb infrared radiation.

The Greenland and Antarctic ice sheets together hold most of Earth's freshwater and would raise sea level dramatically if fully melted.

The Atlantic Meridional Overturning Circulation, AMOC, plays a crucial role in distributing heat through the world's oceans.

The Holocene Climatic Optimum was a period of relatively warm climate roughly 9,000 to 5,000 years ago.

Stratovolcanoes are characterized by alternating layers of lava flows and pyroclastic material, often producing explosive eruptions.

The jet stream is a fast-flowing, narrow air current in the upper troposphere that influences weather patterns.

The Earth has a layered structure consisting of crust, mantle, outer core, and inner core.

The San Andreas Fault is a continental transform fault that runs roughly 1,200 kilometers through California.

Volcanoes form most commonly along tectonic plate boundaries and at hotspots.

Atmospheric carbon dioxide concentrations have risen from about 280 parts per million in pre-industrial times to over 420 parts per million in the 2020s.

The Earth's troposphere extends roughly from the surface to 8 to 15 kilometers altitude, varying with latitude.

Glaciers and ice sheets currently store approximately 69 percent of the world's freshwater.

Tides on Earth are primarily caused by the gravitational pull of the Moon and, to a lesser extent, the Sun.

Climate refers to long-term average weather patterns, while weather refers to short-term atmospheric conditions.

Death Valley in California has recorded the highest reliably measured air temperature on Earth at 56.7 degrees Celsius in 1913.

Antarctica holds the lowest reliably measured surface temperature on Earth at minus 89.2 degrees Celsius, recorded at Vostok Station in 1983.

Tsunamis are large ocean waves usually caused by underwater earthquakes, volcanic eruptions, or landslides.

Krakatoa erupted catastrophically in August 1883, producing one of the loudest sounds ever recorded.

Hydroelectric power generates electricity by using flowing water to turn turbines connected to generators.

Methane is a more potent greenhouse gas than carbon dioxide on a per-molecule, per-decade basis.

Mount Saint Helens erupted catastrophically on May 18, 1980, in Washington state.

The Earth's circumference at the equator is approximately 40,075 kilometers.

The mass of the Earth is approximately 5.972 times 10 to the 24th power kilograms.

The Earth's inner core is solid iron-nickel alloy at temperatures comparable to the Sun's surface, around 5,000 to 6,000 Kelvin.

Plate tectonics describes the movement of large pieces of Earth's lithosphere over the asthenosphere.

Earthquake magnitude is commonly reported on the moment magnitude scale, which has largely replaced the original Richter scale.

The atmosphere is composed by volume of approximately 78 percent nitrogen and 21 percent oxygen, with traces of argon, carbon dioxide, and other gases.

The ozone layer in the stratosphere absorbs most of the Sun's harmful ultraviolet radiation.

The Coriolis effect causes moving air and water in the Northern Hemisphere to deflect to the right and in the Southern Hemisphere to the left.

The water cycle describes the continuous movement of water through evaporation, condensation, precipitation, and collection.

Hurricanes, typhoons, and cyclones are regional names for the same type of tropical cyclone.

The Saffir-Simpson Hurricane Wind Scale rates hurricanes from Category 1 to Category 5 based on sustained wind speed.

Sea level rose approximately 21 to 24 centimeters globally between 1880 and 2020.

The Sahara Desert in northern Africa expands and contracts in cycles tied to climate variability.

The 2004 Indian Ocean tsunami, triggered by a magnitude 9.1 earthquake, killed approximately 230,000 people across 14 countries.

Solar photovoltaic panels convert sunlight directly into electricity using the photovoltaic effect.

Wind turbines convert kinetic energy from wind into electrical power.

Global average surface temperatures have risen by approximately 1.1 to 1.3 degrees Celsius since pre-industrial times.

The Arctic is warming about three to four times faster than the global average.

Coral bleaching occurs when stressed corals expel their symbiotic algae, often due to elevated water temperatures.

A year on Earth is approximately 365.25 days, which is why a leap day is added every four years (with exceptions).

A day on Earth is the time it takes for Earth to rotate once, approximately 23 hours, 56 minutes, and 4 seconds for a sidereal day.

Earth's mean radius is approximately 6,371 kilometers.

The Intergovernmental Panel on Climate Change was established by WMO and UNEP in 1988 to assess scientific information on climate change.

The Convention on Biological Diversity, opened for signature in 1992 at the Rio Earth Summit, has three main goals: conservation, sustainable use, and fair sharing of benefits.

The Holocene is the current geological epoch, beginning approximately 11,700 years ago at the end of the last glacial period.

Plate tectonic theory was developed in the 1960s, building on continental drift hypothesized by Alfred Wegener in 1912.

Earth has experienced five major mass extinction events in its history, the most recent being the Cretaceous-Paleogene extinction 66 million years ago.

The Cambrian explosion, around 538 million years ago, was a relatively rapid diversification of complex multicellular life.

The world's tropical rainforests are sometimes called the lungs of the planet because they contribute significantly to atmospheric oxygen and absorb carbon dioxide.

The Mariana Trench reaches its greatest depth at the Challenger Deep, located in the western Pacific Ocean.

Coal is a fossil fuel formed primarily from the remains of ancient plants compressed and heated over hundreds of millions of years.

Geothermal energy harnesses heat from the Earth's interior for electricity generation and direct heating.

Tidal energy converts the energy of ocean tides into electricity, typically using underwater turbines.

Hydrogen fuel cells generate electricity through an electrochemical reaction between hydrogen and oxygen, producing only water as a byproduct.

Time zones are regions of Earth that have the same standard time, established to address differences in solar time across longitudes.

Daylight saving time advances clocks during warmer months so that evenings have more daylight and mornings have less.