it is the deeper concave offered by zero skateboards
There are some meaning on the term " concave up". However, in most cases, a concave is a hallow curve. A half circle with an opening is also a concave. Concave up means to concave somethings.
If an object is concave, it means that is contains a surface that curves inward. Eyeglass lenses and bowls, for example, can both be said to be concave.
Do you mean is a meniscus always concave? If so, then no. For example, the meniscus of mercury is convex.
bent or curved inwards
yes
Concave means that there is a dip in the object, like it has caved in. Bi-concave means that it is dipped in on two sides of the object. A good example is a red blood cell. It is a bi-concave disk - it has dips on two sides of it.
It means they suck
what concave means in blessed
concave
The opposite of convex is concave. Concave shapes have an inward curve, while convex shapes have an outward curve.
A mirror with a surface that curves inward
In geography, convex refers to a landform or terrain that bulges outward in a rounded or curved shape, often resembling a dome or hill. This term is commonly used to describe features such as mountain peaks or hillsides that curve gently outward.