tile blockers with rewards that makes no sense

[SpectralShade]

Best I've seen so far is toxic Kelp. Clearing it gives me tempestous mountains...

I'm still trying to figure out how those 2 are connected in any way that makes sense...

 

[Derp]

it's very invasive kelp

 

[glee8e]

Um, perhap there is a lake on top of that mountain which has too many toxic kelp within?
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Use your imagination! There had to be a reason for this...

 

[Tindalosihound]

It would probably make more sense if features and blockers had types; such as underwater (underwater vents/submerged ore veins/teeming reef/tropical island/crystal reef/toxic kelp) or subterranean (ore-rich caverns/fungal caves/dust caverns/crystalline caverns/deep sinkhole.)
That way blockers would block off more fitting features.

Of course, there could do with being more non-agricultural features as well in general.

 

[InvisibleBison]

Underwater mountains.