The document describes four main terrestrial ecosystems: deciduous forests, coniferous forests, rainforests, and grasslands. Deciduous forests have four seasons and trees that lose their leaves in fall. Coniferous forests are colder and have needle-like leaves and trees that produce seeds in cones. Rainforests are very warm, rainy, and humid with rich plant and animal life. Grasslands have fertile soil covered in tall grasses and some shrubs with few trees, and are warm with some rainfall.