Βιβλίο Solutions - Στοιχειώδης - Πολιτισμός 6

a valley that is deep and has very steep sides, through which a river is flowing usually

a trip that has been organized for a particular purpose such as a scientific or military one or for exploration

very unusual, special, or surprising

an area containing still water that is comparatively smaller than a lake, particularly one that is made artificially

to prevent someone or something from being damaged or harmed

a range of things or people with the same general features but different in some details