How do birds like eagles and gliders manage to stay aloft without flapping their wings for hours? Explain the scientific principle involved.
عقاب جیسے پرندے اور گلائیڈر گھنٹوں پَر پھڑپھڑائے بغیر فضا میں کیسے رہتے ہیں؟ متعلقہ سائنسی اصول واضح کریں۔
Solution & explanation
Upward thermals can supply lift and altitude. They circle to remain in the rising air; they still lose height outside useful updrafts unless other lift is available.
Independent study answer. Original textbook ↗ · English-medium printed page 31.