โลก, เปลือก, ธรรมชาติ, สัตว์, หอยทาก, สัตว์ในกลุ่มมอลลัซค, ดิน, ชีวิต, แคลเซียม, เบา, การสะท้อน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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