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In this course you will learn about:
- Archimedes discovery.
- Why some objects float and others sink.
- Buoyant force.
- Archimedes principle.
In this course you will learn about:
These three short online lessons discuss asteroids, comets and meteors.
Patterns and processes of evolution. How evolution and natural selection are reflected in the similarities and differences of organisms.
These two short online tutorials discuss how the earth rotates and then the earth's revolutions.
In the first URL, the YouTube video explains why earth has spring, summer, autumn and winter seasons. The second URL summarizes the key takeaway points.
This online tutorial will explain the earth's shape and its hemispheres.
This online article delves into our the sun and planets were formed.
These four short online lessons will cover the following:
This online resource explores the following topics:
Food webs are models that demonstrate how matter and energy is transferred between producers, consumers, and decomposers as the three groups interact within an ecosystem. Transfers of matter into and out of the physical environment occur at every level. Decomposers recycle nutrients from dead plant or animal matter back to the soil in terrestrial environments or to the water in aquatic environments. The atoms that make up the organisms in an ecosystem are cycled repeatedly between the living and nonliving parts of the ecosystem.