Merriam Webster: Dictionary Illustration: Forms of Leaf

Basic diagram of a solar eclipse illustrates the relative positions of the sun, moon, and earth.

Basic diagram illustrating five main structures of a feather.

This is basic cloud chart illustrating shape and relative altitude of ten key cloud types. Scroll down to the bottom for the list of cloud types by name.

Labeled illustration showing the cones of nine different conifers.

Labeled illustration of five types of sharks: mako, tiger, thresher, hammerhead, and great white.

Labeled illustration of five types of bridges: beam bridge, truss bridge, arch bridge, suspension bridge, and cable-stayed bridge.

A labeled diagram of three types of volcanoes: cinder cone, shield, and stratovolcano.

Labeled illustration of three patterns of veins in leaves.

Labeled illustration of a plant and an animal cell and their parts.

Labeled illustration of the principal parts of the eye.