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Bulan jaraknya sekitar 384.000 km dari Bumi, gravitasi bulan masih cukup kuat buat narik air laut. Air laut sifatnya cair dan gampang berubah bentuk jadi waktu bulan ada di satu sisi Bumi, gravitasi bulan narik air laut ke arahnya, Jadilah pasang naik. Tapi anehnya, sisi yang berlawanan juga bisa mengalami pasang karena gaya sentrifugal dari rotasi Bumi sama efek keseimbangan massa. Makanya tiap hari bisa ada dua kali pasang naik dan dua kali surut. Kalau nggak ada bulan efek pasang surut masih...
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Cargando
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