林老师四年级班
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Chinese (中文)
Science 科学
Water cycle 水循环
Weather 天气
Rocks 岩石 Minerals 矿物
Fossils 化石
Utah Environment 犹他环境
Weekly Newsletter 新闻周报
Announcement (告示)
Games 游戏
HSK 2 Word list
Video
Types of Soil
粘土 层
淤泥层
沙层
What's in the Soil?
Mineral Matter
(无机物)
1) Sediments
2) Rocks
3) Pebbles
Organic Matter
(有机物)
1) Wood
2) Bugs
3) Worms
4) Roots
5) Grass
6) Leaves
7) twigs
Layers of Soil