Types of trees according to the duration of the leaves. Picture of a pine tree with an evergreen needle-shaped leaf. There are approximately 60.000 o 70.000 species of trees. They can be sorted by numerous criteria, from their use in gardening until the value of its timber. However, the two main criteria which are usually taken into account are the duration of the leaves and the type of flowers they produce.
July 27, 2010. 1  Brita water filters clean and sanitize drinking water. 2  Remove the filter cartridge. 3  Add six to eight drops of bleach to one gallon of water in the sink or a large bowl.  Fill your sink with enough fresh tap water to submerse the entire filter 1  cartridge. Fill the pitcher with water.
Add distilled water until flask is about two-thirds full. Attach the flask to a vacuum for 15-20 minutes. After the de-aerating process is complete, carefully add distilled water up to the 500ml mark. Be careful not to reintroduce air into the flask. This is done by adding water very slowly. Dry the neck of the flask above the mark with paper towels.