(Reading voc) It is predicted that in 150,000,000 years from now all continents will be (slowly become one mass) _______ together as one land mass.
FUSED
(Reading voc) Photosynthesis will no longer be possible as a result of 99% of species will "die out" (synonyms)
CEASE TO EXIST / BECOME EXTINCT / BECOME A THING OF THE PAST
(Reading voc) The planet will be bathed in gamma radiation from a supernova, ________ (start a powerful process) mass extinction.
TRIGGERING