Add Papers Marked0
Paper checked off!

Marked works


Viewed works

Shopping Cart0
Paper added to shopping cart!

Shopping Cart

Register Now

internet library library
Showing 1 - 2 of 2 on 1 page
Papers Paper packsBeneficial!
  • Ozone Layer

    Presentations for secondary school11  

    Ozone layer is mainly located in the lower portion of the stratosphere -10km to 50km above Earth Ozone layer not only protects animals,plants and human’s from sun ultraviolet ...

  • Effects of Tropospheric Ozone

    Summaries, Notes for secondary school2  

    Ozone also make changes on crop quality, it produce more protein-rich grains in wheat. Ozone reduces starch and sugar content, increase ascorbic acid content in potato. Plant can ...


Choose Authorization Method

Email & Password

Email & Password

Wrong e-mail adress or password!
Log In

Forgot your password?


Not registered yet?

Register and redeem free papers!

To receive free papers from it is necessary to register. It's quick and will only take a few seconds.

If you have already registered, simply to access the free content.

Cancel Register