NASA
Water Works on a Blue Planet
Keep within a water budget. Learners find out that less than 2.5% of Earth's water is available to drink—and that there is a fixed amount of water. Scholars read an interesting article comparing the available water to a game of Monopoly...
University Corporation for Atmospheric Research
Ucar: The Carbon Cycle
A comprehensive introduction to the carbon cycle. The cycle of atoms between living and non-living things is known as a biogeochemical cycle. The most common of these are the carbon and nitrogen cycles.
Khan Academy
Khan Academy: The Citric Acid Cycle
The citric acid cycle (also known as the Krebs Cycle) is actually a part of the much larger process called cellular respiration, the process where your body harvests energy from the food you eat. Yes, the citric acid cycle has the same...
University Corporation for Atmospheric Research
Ucar: Biogeochemical Cycles
The ways in which an element or compound such as water moves between its various living and nonliving forms and locations in the biosphere is called a biogeochemical cycle. All of the atoms that are building blocks of living things are a...
Other
Association for Computing Machinery : Iso 12207 Software Life Cycle Standards
An article explaining ISO 12207; what it provides and how it relates to other standards dealing with software life-cycle processes.
University Corporation for Atmospheric Research
Ucar: The Water Cycle and Climate Change
Water moves from place to place through the water cycle, which is changing as climate changes. Learn how the water cycle is changing as global temperatures rise.
Open Curriculum
Open Curriculum: Water and Water Cycle
An illustrated article helps learners understand the water cycle and the distribution of Earth's water.
National Earth Science Teachers Association
Windows to the Universe: The Nitrogen Cycle
Interesting information on the Nitrogen Cycle as it relates to the Earth system.
Other
Gartner: 6 Trends on the Gartner Hype Cycle for the Digital Workplace, 2020
The need to improve the digital resiliency of the workforce during and after the COVID-19 pandemic has drastically accelerated trends in digital workplace technology. Read about the significant ways the pandemic is changing the world of...
Other
S Cool: Engery Flow and Nutrient Cycle
This website describes trophic levels, transfer of energy between trophic levels, pyramids of ecology, and nutrient cycles within the environment.
American Geosciences Institute
American Geosciences Institute: What Is the Water Cycle?
See Earth's water cycle as a closed system, where all the water is cycled through the atmosphere.
Other
The Hydrological Cycle an Human Impact on It. [Pdf]
The hydrological cycle is usually called a recurring consequence of different forms of movement of water and changes of its physical state on a given area of the Earth. The role of different processes in the hydrological cycle and their...
Ducksters
Ducksters: Biology for Kids: Cell Division and Cycle
A site about cell division and the cell cycle in the science of biology including mitosis, meiosis, and binary fission.
Open Curriculum
Open Curriculum: Chromosomes and the Cell Cycle
This article illustrates the properties of cell division in prokaryotes and eukaryotes.
Open Curriculum
Open Curriculum: Recycling Matter in Ecosystems
Students learn about biogeochemical cycles that recycle matter on Earth.
Khan Academy
Khan Academy: Pyruvate Oxidation
How pyruvate from glycolysis is converted to acetyl CoA so it can enter the citric acid cycle. Pyruvate is modified by removal of a carboxyl group followed by oxidation, and then attached to Coenzyme A.
University of Oxford (UK)
American National Biography Online: Depressions, Economic
Depressions are sustained troughs in the business cycle characterized by declines in output, employment, income, and trade. While they date from the earliest years of American history, little is known about them from the Colonial Era....
American Geosciences Institute
American Geosciences Institute: How Is Water Recycled in Nature?
Learn about nature's most reliable geochemical cycle, the water cycle.
Curated OER
Kids Health: All About Menstruation
Article and video provides a thorough discussion of the Menstral Cycle answering questions for teens.
Other
Science X: Research Illuminates Inaccuracies in Radiocarbon Dating
This article discusses research on the accuracy of radiocarbon dating. It was determined that the standards used for radiocarbon dating may be flawed due to variations to the radiocarbon cycle in different climatic regions of the world....
University Corporation for Atmospheric Research
Ucar: Carbon Dioxide
Learn all about Carbon Dioxide, an important constituent of our planet's air playing an important role in Earth's carbon cycle and photosynthesis.
FNO Press
From Now On: The Research Cycle, 2000
Excellent site from From Now On for students who are assigned research papers and need to begin finding and reading material. Part of a book, the site gives information on questioning, evaluating, planning, gathering, sorting,...
Smithsonian Institution
Smithsonian Gardens: Butterfly Gardening Fact Sheet [Pdf]
This fact sheet provides a comprehensive overview of butterfly gardening. Learn about the life cycle of the butterfly, what plants attract them and what we can do as a society to preserve these marvelous habitats.
NASA
Nasa Earth Observatory: Mystery of the Missing Carbon
This article discusses the mystery of the one to two billion metric tons of missing carbon from the global carbon budget. Scientists do not know where between fifteen and thirty percent of the carbon released each year disappears to, but...
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