Non-Renewable vs Renewable Energy: Impacts and Sources
Non-Renewable Resources: Advantages and Disadvantages
The energy from renewable sources is relatively inexpensive and easy to obtain. However, fossil fuel reserves are limited. Coal and oil are highly polluting fuels that contribute to acid rain and the greenhouse effect. Nuclear fission reactors produce long-lasting radioactive waste that requires secure storage.
Acid Rain
Sulfur oxides react with water vapor in the upper atmosphere, producing sulfuric acid, while nitrogen oxides produce nitric acid.
Read MoreMaterials Science: Properties, History, and Nanotechnology
Introduction to Materials Science
Everything in the universe exists in a material form. Matter, as it occurs in nature, has specific properties. Matter is constituted by particles. The Big Bang created atoms, initially Hydrogen and Helium. The nucleus of stars produces heavier atoms like Iron. Supernova explosions create the rest of the heavy atoms. Materials can be used as pure substances or mixtures.
Types of Materials
- Raw Materials: Obtained directly from nature, such as wood, granite, and sand.
Soil Formation, Composition, and Conservation
Soils: Formation and Composition
Soils: are formed from the superficial layer of the crust. This process is called pedogenesis.
Stages of Soil Formation:
- Formation of Horizon C: Mainly due to temperature changes, the rocks undergo physical weathering, disintegrating into pieces. Chemical weathering alters some minerals in the rocks.
- Appearance of Horizon A: Living organisms are established on horizon C. First, lichens and mosses, then bacteria, fungi, and finally more evolved living organisms. Living
Rock Deformation, Magmatism, and Seismic Activity
Deformation of Rocks
- Compressive stresses: Convergent forces that usually occur in subduction zones and collision areas.
- Tensional stresses: Divergent forces that act on the rocks of rifts.
- Shear stresses: Transform forces that occur at transform boundaries.
How Do Rocks Respond to Stress?
Rocks respond in an elastic way (they accumulate elastic energy). If the stress continues near the surface, the rocks break and release the elastic energy (they are rigid), causing earthquakes and fault joints.
Factors
Read MoreRenewable Energy Sources: Geothermal and Tidal Power
Geothermal and Tidal Energy Sources
The heat for geothermal power comes from ongoing radioactive decay and primordial heat left over from the formation of the Earth. The energy can be tapped anywhere on the Earth’s surface, but it is best in volcanically active areas.
Radioactive Decay
The decomposition of species gives rise to uranium-235 and thorium-232. This process continually replenishes geothermal energy.
Primordial Heat
As the name implies, primordial heat has existed since the creation of the
Read MoreEcosystems and Biomes: A Comprehensive Look at Earth’s Habitats
Ecosystems: Interconnectedness of Life
From Geosphere to Biosphere
Ecology is the science that studies the characteristics of living beings and the environment in which they live. Key concepts include:
- Biotope: The physical environment where living organisms of an ecosystem develop their life.
- Biocenosis: The community of living beings in a particular ecosystem.
- Habitat: The specific location where an organism lives.
Terrestrial and Aquatic Environments
- Terrestrial Environment: The surface of continents.