Grasslands - Flat areas with grass and a few trees. They have hot summers and cold winters. , Tundra - The coldest terrestrial ecosystem. It is so cold that the top layer of soil is nearly always frozen. It is a vast area with no trees and just a few low plants., Ponds - They are small freshwater ecosystems. They can be natural or man-made. Aquatic plants like water lilies grow here., Oceans & Seas - These are the biggest aquatic ecosystems. They contain salt water in constant motion due to waves and currents., Rivers - These are bodies of flowing water. They are home to plants and algae, turtles, otters, and salmon., Lakes - These are large bodies of still water. Some plants like reeds grow in still water. They are home to trout, frogs, water snakes and birds., Deciduous Forests - They are typical of humid regions with cool summers. There are many types of trees, like oaks, maples, and beech trees. Ferns and mosses are common., Rainforests - They have a hot, humid climate with abundant rain all year round. They are the most biodiverse ecosystems on Earth. , Cities - These are urban ecosystems. They include green areas such as parks, blue areas such as rivers, ponds, and fountains, and grey areas such as buildings and houses., Mediterranean Forests - These are in dry regions with warm summers. Most of the trees are evergreen, like pine trees and holm oaks., Deserts - These are the driest regions in the world. There is little rain. They have very hot days and very cold nights. A few grasses and small shrubs grow here. ,

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