It was formed by ancient volcanic eruptions.
The transition from gas to liquid is called condensation. An example would be water droplets forming on an ice cold glass placed in room temperature.
If net external force acting on the system is zero, momentum is conserved. That means, initial and final momentum are same → total momentum of the system is zero.
Molecular structure of the primary cell wall in plants. Up to three strata or layers may be found in plant cell walls: The middle lamella, a layer rich in pectins. This outermost layer forms the interface between adjacent plant cells and glues them together.
