Tutor and Freelance Writer. Science Teacher and Lover of Essays. Article last reviewed: 2020 | St. Rosemary Institution © 2010-2021 | Creative Commons 4.0

How to Detection Alcohol in Breath, Blood & Urine

Breathalyzer – Alcohol testing devices The Breathalyzer device contains: A system to sample one’s breath and Two glass vials containing the chemical reaction mixture.  A system of photocells connected to a meter measure the color change associated with the chemical reaction. To measure alcohol, a person breathes into the device. The breath sample is bubbled…

Physical Geology & Plate Tectonics

Geology (study of Earth) is important for energy and natural resources, solving environmental problems, building cities and highways, predicting and protecting against natural disasters like earthquakes, volcanic eruptions, landslides, floods Uniformitarianism: fundamental principle “the present is the key to the past” How long? geologic time is measured in billions of years Where and How? After…

Porphyria’s Lover by Robert Browning Analysis

“Three times her little throat around, and strangled her. No pain she felt”: Robert Browning’s “Porphyria’s Lover”, written by Robert Browning first appeared in 1836. This dramatic monologue tells the story of a male’s sexual fantasy towards his lover Porphyria’s corpse. The title of the monologue is written in third person, which makes it appear…

Igneous Rocks: Formation, Composition, Naming

Igneous rocks crystallize from molten silicate material called magma that forms at high temperatures and pressures deep in the Earth. Magma rises through the crust and either reaches the surface by volcanoes (extrusive) or cools below surface (intrusive). How Magmas Evolve – according to Bowen’s Reaction Series: discontinuous (different molecular structures of olivine [single tetrahedra],…

Buddhism and the Self: Four Noble Truths

The centerpiece of Buddhism is the doctrine of Interdependent Arising There are no independent, enduring selves that reap the benefits and suffer the misfortunes of life Persons are constituted by five sets of processes: Physical processes: nervous system, immune system, DNA, etc. Processes of sensation: responsible for feelings of pain and pleasure Perceptual processes: responsible…

Minerals: Silicates, Carbonates, Ores

Minerals are solid chemical compounds that combine to form rocks. They are found in nature and vary in atomic bonding, molecular structure, and element composition, all of which determine their chemical, physical properties and permit their identification. ‑ An infinite number of chemical combinations are possible and almost 4000 natural minerals are known; however, only…