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A leaf is a perfect example of a biodegradable product -- it is made in the spring, used by the plant for photosynthesis in the summer, drops to the ground in autumn and assimilated into the soil to nourish the plant for the next season.

The leaf example suggests that the proper rate is that which is appropriate to the ecosystem.

The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth and is retained by Earth's gravity.

The atmosphere of Earth protects life on Earth by absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night (the diurnal temperature variation).

Air content and atmospheric pressure vary at different layers, and air suitable for use in photosynthesis by terrestrial plants and breathing of terrestrial animals is found only in Earth's troposphere and in artificial atmospheres.

The atmosphere has a mass of about 5.15 three quarters of which is within about 11 km (6.8 mi; 36,000 ft) of the surface.

These challenges are international in scope and are priorities for the Central Intelligence Agency.

If you have information about these or other national security challenges, please provide it through our secure online form.

The general consensus of even the most doubting researchers is to accept a "1350" date as the beginning of the "undisputed" or documented history of the Shroud of Turin.

However, with limited staff and resources, we simply cannot respond to all who write to us.

Submit questions or comments online By postal mail: Central Intelligence Agency Office of Public Affairs Washington, D. 20505 By phone:(703) 482-0623Open during normal business hours.

The information you provide will be protected and confidential.

The CIA is particularly interested in information about imminent or planned terrorist attacks.

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