..Savannas are characterised by the trees being sufficiently small or widely spaced so that the canopy does not close.
What does canopy mean in this sentence?The tree canopy - the way in which trees in a wood or forest appear to make a roof with their branches.
Can canopy mean the sky as well
The canopy is blue Poetically, it's used like this.
Since we are talking about sky, "heavens" means the same as sky? Yes
The heavens are raining today.
Should the verb be plural agreement Yes