During the water cycle, water _____ _____ from the oceans into the atmosphere many times. (evaporate)
has evaporated
During sunny days, the sun _____ _____ the water on the Earth's surface. (heat)
has heated
Clouds _____ _____ after water vapor cools and condenses. (form)
have formed
Who ____ ________ how the water cycle works throughout the years? (study)
have/ has studied
Scientists __________ evidence that climate change __________ the water cycle. (not find / affect)
haven´t found / has affected
Many glaciers _____ _____ significantly in recent decades since the temperature on Earth _____ ________. (melt / increase)
have melted / has increased
Some rivers and lakes _____ ____________ from drought seasons. (not recover)
haven´t recovered
_____ your city ever _________ a drought or a flood? (see)
has - seen
Rain __________ from the clouds but __________ the ground. (fall - not reach)
has fallen - hasn´t reached
