Where is oceanic crust thickest?
a.at mid-ocean ridges
b.in the center of ocean plains
c.at deep-sea trenches
d.none of the above

Option A, at mid-ocean ridges, is the correct answer.

The topmost layer of the nautical share of a tectonic plate is known as the Oceanic crust. The Ocean Ridge is created as an effect of raising up of magma from the asthenosphere. Mid-ocean ridges are a large, seismically activated submarine elevation system located in the center of the basin of an ocean and considering the situation of the up-welling of magma connected with seafloor expanding. Thus they are as thick as 6 Km at the mid-ocean ridges.

Explanation:

Gleeking is the act of shooting saliva out from under your tongue. Many people have gleeked on accident when yawning or flicking their tongue. You can teach yourself how to gleek on purpose by gathering enough saliva, flicking your tongue along the roof of your mouth, and jutting your jaw out.