Earth Science

*PANI he PANI* 100% PANI k HOSOL K LAI
ZAMEEN KA SURVEY KERWAIN.
*Geological Resistivity Survey*
Hydro Solitions
Cell 03410004431

Simple diagram to understand convergent plate boundary and Subduction zone......

8. OBSIDIAN
What Type of Rock Is It? Igneous
What Does It Look Like? Obsidian is a glass and is usually black, although sometimes it may be slightly grayish or greenish. It may include some white crystals that look like snowflakes (snowflake obsidian). It may include swirls of a red color. Obsidian breaks and chips like glass. The location where the chip came out is scoop shaped, like the inside of a clam shell. The chip often has ridges that that are semicircular. This kind of break is called a conchoidal fracture.
What Minerals Make Up the Rock? black glass
How Was It Formed? Obsidian is volcanic. It forms from rapid cooling lava that has a lot of silica. The lava cools so fast that crystals do not have time to form.

3.CONGLOMERATE
Conglomerate looks like a mixture of sand and different sizes of rounded pebbles. The pebbles are the important observation.
What Minerals Make Up the Rock? mostly quartz
How Was It Formed? Sand and pebbles collect along sea shores, lake shores, or river banks. They are compacted by the weight of sediments that collect above them and cemented by material dissolved in the water that seeps through them.
Related Rocks: Breccia looks like conglomerate, but the "pebbles" in it are jagged and blocky, not rounded.