Definition of leader: A person or thing that holds a dominant or superior position within its field, and is able to exercise a high degree of control or influence over others. See also leadership. She wanted to be the leader of the group, because she thought that she had the best ideas out of anybody.
If so, chances are you already know what terracotta is. Terracotta is a clay-like earthenware ceramic that can be either glazed or unglazed. In addition to being used for flower pots, terracotta is also often used for water and sewage pipes, bricks and sculptures. The word âterracotta comes from the Italian words for âbaked earth..
The chalk used in classrooms around the world is a type of sedimentary rock. Limestone is a sedimen â¦ tary rock that is used in concrete, building stones, antacids, soil conditioner, and steel making. Coal is another sedimentary rock which is used to produce heat and electricity. Shale is used to make brick. Sandstone and limestone are used as building stone and in the production of glass. 2  Limestone is also used for hard core in roads, and is cooked to make cement. 3  Shale is mixed with sand and used to make bricks.