Rocks in TimeVersion en ligne How sand becomes stone over ages. par Courtney Bezdek 1 I am formed when countless grains of sand are pressed and cemented together over long ages; heat and mineral-rich fluids help me gain strength. Hints 1 The word suggests it is made from sand plus stone. 2 A common sedimentary rock found in deserts and layers of cliffs. 3 Built from sand grains stuck together. 2 Rocks formed by deposited materials layering and compacting together over time. Hints 1 Often contains fossils or remains of once-living things 2 Pressure from overlying layers compacts and cements the grains 3 Forms from bits that settle out of water or air 3 Rocks formed near the surface over time Hints 1 Created by deposition and compaction at or near the surface 2 Common types include sandstone, shale, and limestone 3 Built from particles and remains of other materials 4 Rocks or mineral fragments detached from a larger rock. Hints 1 Term describes a piece broken off from a rock. 2 Used in geology to classify pieces of sediment by size. 5 I appear as flat, repeating layers in a rock, hinting at its story across time. Hints 1 I am the defining feature of many rocks formed from settle sediments. 2 Each sheet may reflect a different environment or moment in history. 3 I show up as layers or bands. 6 This rock forms when minerals crystallize as seawater dries up. Hints 1 A type of sedimentary rock 2 Includes salts like rock salt 3 Results from evaporation of seawater 7 Made from skeletons and shells of sea creatures Hints 1 I am a type of limestone and am part of the sedimentary rock family 2 I am made from calcium carbonate 8 I am made from fossils or remains of plants and animals Hints 1 I am part of the sedimentary rock family
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