Giant creatures: as you scale up a creature, in this video an elephant, the mass increases with volume (x³) while the skin surface increases with the area (x²). So as the elephant gets bigger, a larger outward pressure of guts and blood is pushing against the relatively less surface area of skin. At a certain bigness, the sack of skin can't support the weight of the contents and the animal bursts. There are no titanic giants outside of the water.
On the elephantine rock structures: wind carrying water, ice, sand blows against the rock face. Places that collect more airflow are worn away faster than places with less airflow. Eventually the rock smoothes out into the most naturally aerodynamic shape available to its circumstance. Life also adapts its shape to the environment, and so over many generations elephants grow to be more aerodynamic to fit their environment. The shape of the stone and the shape of an elephant are similar because both are sculpted by æons of wind.
Giant creatures: as you scale up a creature, in this video an elephant, the mass increases with volume (x³) while the skin surface increases with the area (x²). So as the elephant gets bigger, a larger outward pressure of guts and blood is pushing against the relatively less surface area of skin. At a certain bigness, the sack of skin can't support the weight of the contents and the animal bursts. There are no titanic giants outside of the water.
On the elephantine rock structures: wind carrying water, ice, sand blows against the rock face. Places that collect more airflow are worn away faster than places with less airflow. Eventually the rock smoothes out into the most naturally aerodynamic shape available to its circumstance. Life also adapts its shape to the environment, and so over many generations elephants grow to be more aerodynamic to fit their environment. The shape of the stone and the shape of an elephant are similar because both are sculpted by æons of wind.