Reference Terms
from Wikipedia, the free encyclopedia
Stratovolcano
A stratovolcano is a tall, conical volcano composed of one layer of hardened lava, tephra, and volcanic ash. These volcanoes are characterized by a steep profile and periodic, explosive eruptions. The lava that flows from them is highly viscous, and cools and hardens before spreading very far. The source magma of this rock is classified as acidic, or high in silica to intermediate (rhyolite, dacite, or andesite. or basalt). This is in contrast to less viscous basic magma that forms shield volcanoes (such as Mauna Loa in Hawaii), which have a wide base and more gently sloping profile. Many stratovolcanoes exceed a height of 2500 m.
Related Stories
1
2
Earth & Climate News
October 6, 2025
Oct. 5, 2025 — New research reveals that deep-sea mining could dramatically threaten 30 species of sharks, rays, and ghost sharks whose habitats overlap with proposed mining zones. Many of these species, already at risk of extinction, could face increased dangers ...
Oct. 3, 2025 — Billions of years ago, Earth’s atmosphere was hostile, with barely any oxygen and toxic conditions for life. Researchers from the Earth-Life Science Institute studied Japan’s iron-rich hot springs, which mimic the ancient oceans, to uncover how ...
Oct. 2, 2025 — In 2020, California’s Creek Fire became so intense that it generated its own thunderstorm, a phenomenon called a pyrocumulonimbus cloud. For years, scientists struggled to replicate these explosive fire-born storms in climate models, leaving major ...
Oct. 2, 2025 — Swiss glaciers lost nearly 3% of their volume in 2025, following a snow-poor winter and scorching summer heatwaves. The melt has been so extreme that some glaciers lost more than two meters of ice thickness in a single season. Scientists caution ...
Oct. 1, 2025 — Fungi may have shaped Earth’s landscapes long before plants appeared. By combining rare gene transfers with fossil evidence, researchers have traced fungal origins back nearly a billion years earlier than expected. These ancient fungi may have ...
Sep. 26, 2025 — Scientists have uncovered an unexpected witness to Earth’s distant past: tiny iron oxide stones called ooids. These mineral snowballs lock away traces of ancient carbon, revealing that oceans between 1,000 and 541 million years ago held far less ...
Sep. 26, 2025 — Scientists found that biochar doesn’t just capture pollutants, it actively destroys them using direct electron transfer. This newly recognized ability accounts for up to 40% of its cleaning power and remains effective through repeated use. The ...
Sep. 26, 2025 — Bio-tar, once seen as a toxic waste, can be transformed into bio-carbon with applications in clean energy and environmental protection. This innovation could reduce emissions, create profits, and solve a major bioenergy industry ...
Sep. 26, 2025 — Electrons flow underground in ways far more extensive than once believed, forming networks that link distant chemical zones. Minerals, organic molecules, and specialized bacteria can act as bridges, ...
Sep. 24, 2025 — Rice, a staple for billions, is one of the most resource-hungry crops on the planet—but scientists may have found a way to change that. By applying nanoscale selenium directly to rice plants, researchers dramatically improved nitrogen efficiency, ...
Sep. 24, 2025 — Diamonds hitch a ride to the surface through explosive kimberlite eruptions, powered by volatile-rich magmas. New simulations show that carbon dioxide and water are the secret ingredients that make these eruptions ...
Sep. 23, 2025 — A long-term study in Colorado reveals that insect populations are plummeting even in remote, undisturbed areas. Over two decades, flying insect abundance dropped by more than 70%, closely linked to rising summer temperatures. The results suggest ...
Latest Headlines
updated 12:56 pm ET
Oct. 2, 2025 — A massive quake struck Calama, Chile, in 2024, surprising scientists with its unusual depth and destructive power. Unlike typical deep quakes, it broke past thermal limits and triggered an intense ...
Sep. 23, 2025 — South African diamonds have revealed nickel-rich metallic inclusions, offering the first direct evidence of reactions predicted to occur deep in Earth’s mantle. The study shows how oxidized melts ...
Sep. 22, 2025 — A team at RMIT University has created a cement-free construction material using only cardboard, soil, and water. Strong enough for low-rise buildings, it reduces emissions, costs, and waste compared ...
Sep. 22, 2025 — A sweeping review from NYU Langone Health reveals that everyday exposure to plastics—especially during childhood—poses lasting risks for heart ...
Sep. 22, 2025 — Researchers found that ice can trigger stronger chemical reactions than liquid water, dissolving iron minerals in extreme cold. Freeze-thaw cycles amplify the effect, releasing iron into rivers and ...
Sep. 21, 2025 — University of Maine researchers developed a new process to make HBL, a key ingredient in many medicines, from renewable glucose instead of petroleum. The approach not only lowers drug production ...
Sep. 20, 2025 — In Texas, biologists have documented an extraordinary bird — the natural hybrid offspring of a green jay and a blue jay. Once separated by millions of years of evolution and distinct ranges, the ...
Sep. 20, 2025 — Insects are essential for ecosystems, but mounting evidence suggests many populations are collapsing under modern pressures. A new study used cutting-edge genomic techniques on museum specimens to ...
Sep. 19, 2025 — Egg-eating worms living on Chesapeake Bay blue crabs may hold the key to smarter fishery management. Once thought to be a threat, these parasites ...
Sep. 19, 2025 — Wildfires are no longer a seasonal nuisance but a deadly, nationwide health crisis. Fueled by climate change, smoke is spreading farther and lingering longer, with new research warning of tens of ...