Key Concepts in Physics and Biology: Definitions
Key Concepts in Physics
Wave
Wave: A form of energy propagation from one point to another in space, which is not accompanied by a displacement of matter.
Frequency
Frequency: The number of oscillations of a particle per second. Its unit is the Hertz (Hz).
Wavelength
Wavelength: The distance between two peaks. Its unit is the meter (m).
Reflection
Reflection: The change of direction experienced by a ray of light striking the surface of a body.
Refraction
Refraction: The change of direction experienced by a
Read MoreUnderstanding Key Health and Environmental Factors
What is a Risk Factor?
Risk factors are those that provoke, facilitate, or predispose a person to contract a certain disease, by being exposed to certain causal agents. For example, smoking or working in a mine, where smoke and dust minerals can cause respiratory diseases.
Types of Abiotic Contaminants
- Primary (identifiable): Particles, sulfur compounds, nitrogen compounds, inorganic carbon compounds, CO2 (hydrocarbons), and radioactive compounds.
- Secondary: The way the atmosphere and physicochemical-
Earth’s Relief and Geological Processes: A Comprehensive Study
Biotic and Anthropic Components of Earth
- Biotic components: Wildlife, vegetation
- Anthropic elements: Roads, crops
Atmospheric Phenomena
Atmospheric phenomena include wind and humidity.
Understanding Relief
What is Relief?
Relief refers to the difference in elevation of a land surface. Certain landforms recur with frequency.
Descriptive Relief
Relief is classified by its appearance.
Interpreting Relief
Relief is qualified genetically, taking into account the formation process.
Oceanic Relief
- Abyssal plain
- Oceanic
Universe History, Planet Formation, and Continental Drift
History of the Universe
1. Inflation
The universe expanded rapidly.
2. Formation of Matter
The universe was composed of subatomic particles bathed in a lot of energy called photons. When they cooled, they formed neutrons and protons.
3. First Atoms
Approximately 300,000 years after the Big Bang, hydrogen and helium atoms formed.
4. The Ignition of the Universe
Charged particles interfered with the photons. But, as atoms formed, light could travel freely through the newly created space. The universe became
Read MoreChilean Ecosystems: Flora, Fauna, and Climate Zones
Despite pests, the development of various ecosystems is favored by environmental conditions. These include:
- Shrubs: chilcas, foxtail
- Trees: chan, carob
- Animals: snakes, lizards, foxes, birds, insects
Xero Tropical Forest Region
Located within the absolute desert, this region features possible groundwater reservoirs and the Prosopis Tamarugo tree. Sheep and cattle are also present.
Andean Highlands
North of 23 degrees latitude, this region is influenced by a monsoon climate with summer rainfall. The landscape
Read MoreUnderstanding Ecological Processes and Environmental Rhythms
Environmental Rhythms
Living things respond to environmental changes. Rhythmic movements are also important.
- Diurnal Rhythms: Organisms comply with these changes by altering their periods of rest and activity.
- Seasonal Rhythms: A wide range of behavior is associated with seasonal changes.
- Tidal Rhythms: Changes in sea level periodically affect organisms living on the coasts.
Regeneration After Fire
In a fire, only some underground elements and seeds survive, and the soil suffers significant damage. If
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