Understanding Earth’s Water Cycle and Its Properties
The Hydrosphere
Formation
Around 4.6 billion years ago, during Earth’s formation, high temperatures kept water in vapor form. As the Earth cooled below water’s boiling point, immense precipitation filled the lower surface areas, creating oceans. The majority of Earth’s water resides in these oceans as saltwater. Most freshwater exists as ice and groundwater. The remaining water is distributed across continents and in the atmosphere.
The Water Cycle
Water is in constant motion. Atmospheric water vapor
Read MoreUnderstanding the Rock Cycle: Processes and Structures
Read MoreThe Cycle of Rocks
On the Surface
It produces the weathered rocks and their transformation into sediments, transported by geological agents and accumulated in sedimentary basins.
Inside the Earth’s Crust
The materials are subjected to high temperatures, and the sediments become rocks.
Pressure
Due to the weight of rocks, pressure increases with depth.
Temperature
Temperature increases with depth.
Efforts of Understanding and Detente
Produced by movements in the mantle, compress and stretch the material of
Environmental Issues: Pollution, Climate Change & Resource Management
The Ozone Layer
The ozone layer is essential for life on Earth. Located in the stratosphere, between 12 and 40 km, it forms when ultraviolet (UV) radiation from the sun strikes oxygen molecules, transforming them into ozone. This ozone layer absorbs harmful UV radiation, protecting life as we know it. The presence of chemicals like chlorofluorocarbons (CFCs) prevents the ozone layer from forming normally, leading to its depletion. This can result in increased skin cancer, cataracts, weakened immune
Read MoreKey Environmental Concepts: A Glossary
Albedo
Albedo is the percentage of solar radiation reflected by the Earth back into space. A higher albedo means more reflection and lower temperatures. Areas covered by snow or ice have high albedos.
Hydrologic Balance
Hydrologic balance refers to the equilibrium between water inputs (precipitation) and outputs (evapotranspiration and runoff) in a given area. A balance exists when inputs equal outputs. A deficit occurs when outputs exceed inputs, depleting water reserves. A surplus occurs when
Read MoreNatural Resources: Definition, Classification, and Sustainability
Natural Resources
A natural resource is any naturally occurring substance, whether solid, liquid, or gaseous, that is present in sufficient quantities and is in demand for use in producing goods and services. Examples include agricultural products, raw materials like rocks and minerals, and energy sources such as fossil fuels and nuclear reserves.
A reserve is the portion of a natural resource whose quantity and location are known, and its extraction is technically feasible and economically viable
Read MorePast and Future Climate Change: Understanding Earth’s Climate
Past Climate Change
A) Variations in the Earth’s Climate Before the Quaternary
We know that from the early history of Earth, land and sea distribution was different, undoubtedly impacting the Earth’s climate. We know of the existence of a large continent called Pangaea. This continent would have acted as a brake on ocean currents, preventing them from reaching the middle and high latitudes, which would have remained very cold, resulting in an ice age affecting the highest mountain summits. This would
Read More