Perlite, obsidian and pitchstone are volcanic glass having the same compositions commonly with rhyolite as well as andesite and basalt.
珍珠岩、黑耀岩和松脂岩等玻璃质熔岩以酸为主,
者也常见。
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Now most of these farms are hydroponic or aeroponic systems, which means that instead of using soil, they use a substitute material like polyurethane sponges, biodegradable peat moss and even use inorganic materials like perlite and clay pellets.
现这些农场大多是水培或气培系统,这意味着他们不使用土壤,而是使用聚氨酯海绵、可
物降解的泥炭藓等替代材料,甚至使用珍
岩和粘土颗粒等无机材料。