Holes larger than this will invite larger birds and other predators to invade the box, which can be a danger to the chicks or prompt the invaders to take over the box and evict the current residents. The following chart will help select a birdhouse appropriate for housing a particular species. We not only give you an idea of the specification requirements of the house or platform, but also give you some tips about where and how high to mount it.
Why does the ocean not boil or freeze solid in different regions of the world? Heat is transported by oceanic and atmospheric circulation The pycnocline isolates the majority of the world ocean from heating and cooling brought on by solar energy fluctuations What is the main reason for the stratification in the north polar waters?
Sea IceSea ice includes frozen sea water, such as that in the Arctic Ocean and the oceans surrounding Antarctica, and frozen lake and river water, which occur mainly in the polar regions. Sea ice is formed by the direct freezing of the water on which it floats. If the water is salty, as it is in the ocean and in seas, during the freezing process the salt is left in the water, making the water more salty and denser and the sea ice less salty. Lake and river ice is frozen from fresh water generally and is therefore, not salty.