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Port Said International Schools Better education for future generations Science Department Grade: 7 Worksheet 10 Name: ……………………………………………. Date: ………………..……………………………… ــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــ 1-Classify the following rocks according to their types The rock Type Granite Basalt Sandstone Limestone Marble igneous plutonic rock igneous volcanic rock Sedimentary Sedimentary metamorphic 2 -Write the scientific term: 1. A thin, fragmented and loosened layer consists of a mixture of mineral salts, water, air and decayed organic substances. (Soil) 2. The type of rocks which is formed from the molten matter underneath the earth's crust. (Igneous) 3. The type of igneous rocks which is formed when magma reaches earth's surface in the form of a flow of lava. (Volcanic rocks) 4. The type of rocks which is formed when other rocks are exposed to high pressure& temperature. (Metamorphic rocks) 5. The rock which is formed of calcite. (Limestone) 3-Complete the following sentences: 1. The molten materials underneath the earth surface is called magma while when they reach the earth surface they form lava 2. Granite are examples of igneous rocks. 3. Granite consists of three main minerals which are feldspar , quartz and mica 4. Basalt consists of feldspar, pyroxene and olivine 5. The sedimentary rocks are formed as a result of the process of fragmentation and disintegration of the igneous, sedimentary or metamorphic rocks that are previously existed the deposition 6. Lime stone reacts with hydrochloric acid producing carbon dioxide 4-Compare between: A) Points Granite Basalt Type Plutonic volcanic Color Pink or grey dark Minerals forming each one feldspar , quartz and mica feldspar, pyroxene and olivine B) Points Sandstone Limestone Color yellow White Texture Coarse Smooth Structure Sand grains and quartz calcite 5- Give reasons for each of the following: 1- The crystals of minerals that form plutonic rocks are large sized. Because it cools slowly underneath the earth’s crust and it takes a long time to crystalize 2- Volcanic rocks contain small circular holes. Due to the extruding the of gases from volcanic flows during their cooling and formation of rocks 3- The components of basalt rock cannot be seen by naked eye. Because they are very small in sized and their crystals are very small 4- Effervescence takes place when hydrochloric acid is added to a sample of limestone. Due to the evolving of carbon dioxide gas