To upgrade from Windows 10 Home if you have a Windows 10 product key: 1  Select the Start button, then select Settings > Update & security > Activation. 2  Select Change product key, and then enter the 25-character Windows 10 Pro product key. 3  Select Next to start the upgrade to Windows 10 Pro.
The leaves are segmented, so excess water can drain away. Rainforests have a shallow layer of fertile soil, so trees only need shallow roots to reach the nutrients. However, shallow roots can't support huge rainforest trees, so many tropical trees have developed huge buttress roots.
Buttresses and an arch of the Roselend Dam in France. A buttress dam or hollow dam is a dam with a solid, water-tight upstream side that is supported at intervals on the downstream side by a series of buttresses or supports.The dam wall may be straight or curved. Most buttress dams are made of reinforced concrete and are heavy, pushing the dam into the ground.ater pushes against the dam, but the buttresses are inflexible and prevent the dam from falling over. Buttress or hollow gravity dams were originally built to retain water for irrigation or mining in areas of scarce or expensive resources but cheap labour.