science explorer prentice hall earth science test chapter1 grade 7

Question: Fuel formed under the earth's surface by the decomposition of organic matter is called ______. 1. organic fuel 2. biogas 3. fossil fuel 4. under ground fuel Answer: ..

Question: The family of elements having seven electrons in the outermost shell is ______. 1. alkali metals 2. alkaline earth metals 3. halogens 4. noble gases Answer: ..

When scientists started exploring matter, they discovered that the smallest particle of an element that maintains its chemical identity through all chemical and physical changes is called and 'atom'. Just how small these atoms are can be made out if you realize that there are about 60,00..

. In this table, the elements are arranged in the order of increasing atomic numbers in such away that elements with similar properties fall in the same vertical column. These vertical columns are referred to as 'Groups'. There are eight groups, which are further sub-divided into eighteen sub-group..

Metals and their compounds are found in earth as natural elements known as minerals. Ores are minerals from which metals are extracted profitably and conveniently. Ores contain metal compounds with a lower percentage of impurities. All the ores are minerals, but all minerals are not nece..

Water for All - Water is a unique and remarkable compound, essential to all forms of life. Human beings and the flora and fauna cannot survive without water on this planet. A large amount of life on this planet is aquatic based i.e., can only survive in water. It is the most abundant substance afte..

To avoid the risk of electric shocks, the metal of an electrical appliance is 'earthed'. Earthed means to connect the metal case of the appliance to the earth (at zero potential) by means of a metal wire (copper) called the earth wire. One end of the ea..

Structure of the earth system Earth's history Earth in the solar syste..

Structure of the earth system Earth's history Earth in the solar syste..

Properties of earth materials Objects in the sky Changes in earth and sk..