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A marble is a small spherical object often made from glass, clay, steel, plastic, or agate.They vary in size, and most commonly are about 13 mm (1 ⁄ 2 in) in diameter. These toys can be used for a variety of games called marbles, as well being placed in marble runs or races, or created as a form of art. They are often collected, both for nostalgia and for their aesthetic colors.

Biological pest control is a method of controlling pests such as insects and mites by using other organisms. It relies on predation, parasitism, herbivory, parasitody or other natural mechanisms, but typically also involves an active human management role. Classical biological control involves the introduction of natural enemies of the pest that are bred in the laboratory and released into the ...

Jan 01, 2014 · Vitro Agate also produced another type of brushed opaque marble called the “Parrot” that is collectible. This is a white base marble that has four patches of color on it. The patches can be blue, purple, black, yellow, and green (aventurine or not). "Parakeets" are 5/8” to 11/16” varieties of Parrots. A similar marble is the “Sweet ...

Jan 01, 2014 · Akro also made a single-stream opaque-type of slag called the Cornelian. This marble is a combination of opaque red and white glass, and is very similar to a Brick. The color is not as oxblood-red as a Brick though. Akro Agate also produced a type of Brick. These are darker than the M.F. Christensen Bricks.

Jan 01, 2014 · Superman is opaque light blue base with yellow and red ribbons. Blue Galaxy is red and aventurine black on light blue opaque base. In some tri-color examples, the ribbons are a mixture of two colors. A Superboy is ribbons of mixed red and yellow, on opaque blue based. A Flaming Dragon is ribbons of mixed red and yellow, on opaque green base.