OPEN GEOLOGY

Pressure, Temperature, and Density Variations in the Earth

PLANET EARTH /

The Earth’s internal structure is defined by systematic variations in pressure, temperature, and density. These parameters not only describe the physical conditions at different depths but also control processes such as mantle convection, volcanism, plate tectonics, and the geodynamo. A key concept in understanding Earth’s thermal structure is the geothermal gradient, which explains how temperature […]

Pressure, Temperature, and Density Variations in the Earth Read More »

Age of the Earth

PLANET EARTH /

The Earth is about 4.54 billion years old, formed soon after the birth of the Solar System. This age is calculated primarily by radiometric dating of meteorites, Moon rocks, and the oldest terrestrial minerals (zircons). To understand Earth’s history in detail, geologists divide this immense span of time into hierarchical units: Eons → Eras →

Age of the Earth Read More »

Composition of Earth

PLANET EARTH /

The Earth is a heterogeneous body where chemical elements are unevenly distributed across its major reservoirs: crust, mantle, core, hydrosphere (oceans), and atmosphere. Crust (Continental + Oceanic) The Earth’s crust is dominated by silicate minerals. Elements occur mostly in oxides, silicates, carbonates, and sulfates. Major elements (by weight %): Mantle Dominated by ultramafic rocks (peridotite)

Composition of Earth Read More »

Cl 1 meteorite / Cl1 Carbonaceous chondrite

GEO-ARTICLES, GEOCHEMISTRY ARTICLES /

“Cl” stands for lvuna-type, named after the lvuna meteorite that fall in Tanzania in 1938. The 1 indicates the petrologic type, with 1 = most primitive (least altered by heat but highly altered by water) Key Characteristics Features Description Type Carbonaceous chondrite (Cl group) Alteration Extensively altered by water (aqueous alteration) Chondrules Absent or extremely

Cl 1 meteorite / Cl1 Carbonaceous chondrite Read More »

Stages/types of chemical changes in sedimentology

GEO-ARTICLES, SEDIMENTOLOGY ARTICLES /

In sedimentary petrology and diagenesis, terms like neochemical, allochemical, protochemical and post chemical reactions are used to describe various stages or types of chemical changes. Term Timing Main Process Example Protochemical Very early (surface or shallow) Microbial activity, initial mineral formation Pyrite from sulfate reduction Neochemical Early diagenesis Authigenic mineral growth Dolomite replacing calcite Allochemical

Stages/types of chemical changes in sedimentology Read More »

Eutrophication

CLIMATOLOGY/ METEROLOGY ARTICLES /

Eutrophication is the excessive enrichment of water bodies with nutrients, primarily nitrogen (N) and phosphorus (P), leading to overgrowth of algal and subsequent ecological problems. Causes of Eutrophication Consequences of Eutrophication Prevention & Solution Water Quality Decline Cloudy, greenish water reduces sunlight penetration. Reduce Fertilizer Use Use oraganic alternatives, controlled-release fertilizers. Harmful Algal Blooms Some

Eutrophication Read More »

Scroll to Top