Water is an important environmental component of life. It covers over 70% of the earth's surface. It can be used as drinking water, for bathing, washing, etc. The living thing on earth can’t be separated from the need for water. Water is the main requirement for the process of life on earth. So there is no life if on earth there is no water. However, water can be disastrous if not available in the right conditions, both the quality and quantity.
Kamis, 28 Oktober 2010
Rabu, 27 Oktober 2010
On locations where tectonic plates diverge or converge, volcanoes can be found. A volcano consists of a deep magma chamber where magma accumulates, pipes that lead to surface vents, and the vents through which lava is emitted during a volcanic eruption. Volcanoes are often known to have a mountain-like shape (see picture).
Figure 1: layout of a volcano
Volcanoes that have not erupted for some time are dormant, and volcanoes that have not erupted even in the distant past are called extinct. Volcanic activity and volcanic eruption is usually triggered by alterations of tectonic plates, resulting in landslides or earthquakes.
Selasa, 26 Oktober 2010
Saat ini ketika Gunung Merapi dalam status awas dan mengeluarkan debu vulkanik yang menyebar sampai ke Muntilan, Magelang, Temanggung, Boyolali, dan Yogyakarta, bahkan mungkin sampai di luar wilayah-wilayah tersebut besarnya letusan, arah letusan, dan arah serta kecepatan angin. Debu Merapi yang menyebar menjadi partikel di udara kita / atmosfer tersebut mengandung-unsur-unsur kimia belerang (sulfur).