History of Solar System formation and evolution hypotheses - Lunar origins hypotheses. 1  Over the centuries, many scientific hypotheses have been advanced concerning the origin of Earth's Moon.
Regular irrigation keeps grass green. Improper fertilizing, nutrient deficiencies, diseases and insects can all cause yellow grass. No matter the cause, yellow grass detracts from your home's appearance. Identifying and correcting the issue is essential to restoring your lawn's health and appearance any time of year.
Grass needs iron to make chlorophyll, necessary for photosynthesis. If the green chlorophyll does not develop in young grass, the leaves look yellowish-green and have yellow veins. This is called iron chlorosis. In severe cases of iron chlorosis, the yellow leaves turn nearly white.