OXYGEN-الأكسجين
If an astronaut strikes a match in space, nothing happens. On Earth the tip bursts into flame because it reacts with a gas that is part of the air. That…
If an astronaut strikes a match in space, nothing happens. On Earth the tip bursts into flame because it reacts with a gas that is part of the air. That…
Imagine a world without fruit—without apples and oranges and blueberries, there wouldn’t be any strawberry shortcake, cherry pie, or raspberry sherbet either, and we wouldn’t be very healthy. We get…
Every as soon as in an extended while, the Earth is going thru a length of specifically bloodless climate known as an ice age. بين الحين والآخر ، تمر الأرض…
In 1997, officers from one hundred sixty international locations met in Kyoto, Japan, they wrote an settlement known as the Kyoto Protocol. Countries that signal this settlement promise to burn…
What is ozone layer It is a type of natural gas from the atmospheric gases and has great importance in preserving our planet from ultraviolet rays. It is found in…
What exactly is a flower? Plants make flowers because flowers make seeds. Seeds are away many plants reproduce, or make new plants. So, flowers help plants reproduce themselves. Flowers also…
Colorful tropical fish swim through warm water around a coral reef.The fish are part of the coral reef ecosystem. Beautiful orchids grow on trees that tower above the rain forest…
Why is river water sometimes brown? The water turns brown when it’s full of mud. A brown river is an example of erosion in action. Flowing water carries away, or erodes, tiny bits of…
POLLUTION Acid rain is a kind of air pollution. When coal, oil, or gasoline are burned, they release harmful gases into the air.These gases mix with the moisture that is…
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