Markabka Ruushku waxa uu sameeyay in ka badan 40 safar oo ku wareegsan dhulka iyo safarro dhaadheer, kuwaas oo intooda badan ay ku taageerayeen gumeysigooda Waqooyiga Ameerika ee Ruushka America (Alaska) iyo Fort Ross ee waqooyiga California, iyo dekedaha Baasifigga ee xeebta bari ee Siberia. Safaradani waxay soo saareen qalab cilmi baaris cilmiyeed oo muhiim ah iyo daahfuryo ka dhacay goobaha howlgallada ee Baasifigga, Antarctic iyo Arctic. Su'aal: Intee in le'eg ayay ciidamada badda ee Ruushku ku wareegeen inta u dhaxaysa 1803 iyo 1855?
40 ee