Earths outter layer is like the glass on a lightbulb because it keeps the inside of the lightbulb straight, and also protects you from getting electrocuted (sry if this is wrong, i tried my best to try to help) :))
Tectonic plates, is probably the answer
Medial meniscus are fibrocartilage attached to the tibial collateral ligament, that is, between the medial condyle of the femur and the medial condyle of the tibia.
<h3>What is medial meniscus?</h3>
It is an articular fibrocartilage that extends medially across the knee joint, where it attaches to the tibia anterior to the insertion of the anterior cruciate ligament.
This in the middle zone has continuity with the deep portion of the medial ligament, being well attached to the tibia and femur and acting as a cushion and distributing the weight of the femur.
Therefore, we can conclude that the medial meniscus are fibrocartilage attached to the tibial collateral ligament, that is, between the medial condyle of the femur and the medial condyle of the tibia.
Learn more about medial meniscus here: brainly.com/question/15899347
The rock found in the riverbed that is smooth is from the result of weathering of water in the river and erosion. The rock deep underground was most likely a product of erosion. The dirt and ground above it were eroded and displaced there to cover the rock.