When an uplift pushes a batholith or smaller body of hardened magma toward the surface. And sometimes when magma fails to reach the surface it hardens in to rock. Over time, the forces that wear away Earth's surface such as flowing water, ice, or wind-may strip away the layers above the hardened magma and finally expose it.
Deciding if a trout is a sea trout or a brown trout can be easy if the sea trout is fresh run from the sea âsea trout are distinctively silvery in colour and may still carry sea lice. However, once they have been in fresh water for a while they return to brown trout colours.
Your pond needs sufficient depth so that in winter there is adequate oxygen in the water under the ice to keep the trout alive. In general, trout ponds in this area need about 8 feet of depth and a sufficient source of cold water (such as natural springs) to provide the conditions that trout need.