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Atmospheric layers and physical features involved in trapping smog and pollution during a thermal inversion in a valley.

Parts of an adult butterfly

The astronomical mechanics of lunar day and night, showing sunlight illumination, illuminated and shadowed hemispheres, the terminator line, and the lunar axis of rotation.

The structural components of a duplicated eukaryotic chromosome, from telomeres and arms to chromatin packaging.

Six common substances arranged along the acidic to alkaline pH spectrum from 0 to 14.

Cross-sectional view of Earth's lithosphere and mantle showing how convection cells drive tectonic plate movement at divergent and convergent boundaries.

The primary contact and non-contact force vectors acting on an object in mechanics.

The five traditional biological kingdoms of life represented by characteristic organisms.

The three classes of levers showing the relative arrangements of the fulcrum, load, and effort.