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Did you know that the atmosphere is made up of different layers? In fact, this layer is a huge part of our planet, supporting all life forms. And, you might not know, the atmosphere also plays a vital role in determining the weather! The following facts will help you better understand this fascinating element. But, before you can get started with these fascinating facts, here are a few things you should know about the atmospheric layers.The first layer of the atmosphere is called the troposphere, which is about 500-800 km high. It is a dense environment with a large number of gas molecules and dust, and can reach temperatures of 1700 degrees Celsius. In fact, the atmosphere's composition changes over the course of millions of years, and there are currently several different layers. Learn about the different layers of our atmosphere and how they influence our daily lives.The atmosphere contains a wide range of gases, but two of them are the most important. Oxygen and nitrogen are the most abundant gases in the atmosphere, while other gases are present in trace amounts. The different layers of the atmosphere have different temperatures and densities, and they play a critical role in keeping our world cool. And remember, there are five different layers to the atmosphere. The thickness and density of the layers vary and affect the way our planet experiences weather.
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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