When the tree fell

Q: When the tree fell, it create sound wave. So, where did the energy that prouduced the sound waves come from, and where does the energy go?

When the tree fell down, it gained kinetic energy from the loss of potential energy. It stroke the ground, causing vigorous vibration of the tree trunk ( and sometimes the ground as well). The mechanical vibration of the tree trunk further caused the surrounding air to vibrate. This is the sound heard from the falling tree.
The sound so produced hit other objects, part of the sound energy was absorbed by the object and part reflected by it. The reflected sound energy further hit other objects until all energy was dissipated.
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Q: when the fallen tree glow, what kind of energy it give off?

When the fallen tree glows again, it absorbs sunlight (light energy), and through the process of photosynthesis (光合作用) and a chain of biological/chemical processes, more tree cells (i.e. mass) are produced. The tree trunk then starts to glow upward, thus gaining in potential energy again.

um... the word is glow or grow?

當一棵樹倒下時﹐它的勢能轉變成動能﹐同時﹐該樹因倒下對介質產生擾動，使周圍空氣分子在其平衡位置振動，產生疏密的波動。所以該樹的動能轉成了空氣的動能。當聲音傳開時﹐能量也會逐漸因用於空氣分子的振動和與周圍的空氣分子碰撞而消耗殆盡。
when the fallen tree glow (一棵樹燃燒時)樹的化學能轉成熱能,聲能,光能。