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The soil on Earth is ___ fertile than on Mars
more
The dormant volcanoes are _______ dangerous than active ones
less
The _________ and _________ waters in Earth are called oceans
biggest and deepest
The part where the temperatures are very low is the __________ area on a planet
coldest
We can describe the wildlife on a planet by saying if it's _________ or not than on Earth
richer
It's ______ to travel in space than on Earth
scarier, more dangerous
If it rains more on another planet, we say it's ______ there
wetter
When the planet is closer to the Sun than another one, it must be _______ there
hotter
If a planet reflects more light than another, we say it is ________
brighter
We're travelling very slowly, it could be the _________ journey in space ever!
slowest, longest
