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23 Dec 2017

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Question about English (US)

Researchers hypothesize that granitic soil is the ideal construction material for the desert tortoise because it is not so hard that it makes burrowing difficult or so soft that it could cause tunnels to collapse.
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What does
"it is not so hard that it makes burrowing difficult " mean ?😅
I think...
"it" refer to "granitic soil" .
So...
granitic soil is not so hard.
and because of this ,
it is difficult for us to makes burrowing .

am I right ?😅
and
What does "burrowing" means ?

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