Seeds by Type. Find mixtures for your region, or for special uses such as dry areas, partial shade, attracting animals, low growing, and more. Over 75 choices that will bloom in the second year and for years to come. Over 110 choices for fast color, such as poppies, cosmos, sunflowers, zinnia, and many more. Help the birds, bees, butterflies & hummingbirds by planting wildflowers. Wildflower seeds native to your region.
Swamp gas is the common name for the hydrogen sulfide from decaying matter. In small amounts, hydrogen sulfide is relatively harmless. However, it becomes quite dangerous when present in large amounts, especially in confined spaces.
By far, the most abundant gas in the Earth's atmosphere is nitrogen, which accounts for about 78% of the mass of dry air. Oxygen is the next most abundant gas, present at levels of 20 to 21%. Although humid air seems like it contains a lot of water, the maximum amount of water vapor that air can hold is only about 4%. Abundance of Gases in the Atmosphere. This table lists the eleven most abundant gases in the lower portion of Earth's atmosphere (up to 25 km). While the percentage of nitrogen and oxygen are fairly stable, the amount of greenhouse gases changes and depends on location. Water vapor is extremely variable.