Rocks and the Earth
ScienceGrades 3–624 clues and answers
The three rock types, Earth's layers, and the forces that shape the land: twenty-four clues covering igneous, sedimentary and metamorphic rock, magma and lava, erosion, fossils, tectonic plates and a few famous rocks like obsidian and pumice. A natural fit for a rock-cycle unit or a geology club.
Games with this list
The list
| Clue | Answer | |
|---|---|---|
| 1 | Rock formed when melted rock cools and hardens | Igneous rock |
| 2 | Rock formed from layers of sand and mud pressed together | Sedimentary rock |
| 3 | Rock changed by heat and pressure deep underground | Metamorphic rock |
| 4 | Melted rock under Earth's surface | Magma |
| 5 | Melted rock that comes out of a volcano | Lava |
| 6 | Wind, water or ice carrying rock and soil away | Erosion |
| 7 | Rock slowly breaking into smaller pieces | Weathering |
| 8 | Remains or traces of ancient life preserved in rock | Fossil |
| 9 | A natural solid with crystals, like quartz | Mineral |
| 10 | Earth's thin outer layer | Crust |
| 11 | Earth's thick layer of hot rock beneath the crust | Mantle |
| 12 | Earth's hot center, mostly iron and nickel | Core |
| 13 | Sudden shaking of the ground | Earthquake |
| 14 | An opening in the crust where magma erupts | Volcano |
| 15 | Giant moving pieces of Earth's crust | Tectonic plates |
| 16 | A speckled igneous rock often used for countertops | Granite |
| 17 | A sedimentary rock made of sand grains | Sandstone |
| 18 | A metamorphic rock made from limestone | Marble |
| 19 | Shiny black volcanic glass | Obsidian |
| 20 | A light volcanic rock full of holes that can float | Pumice |
| 21 | How rocks change from one type to another over time | Rock cycle |
| 22 | A mix of tiny rock bits, water, air and rotting plants | Soil |
| 23 | A scientist who studies rocks and the Earth | Geologist |
| 24 | A solid with flat faces in a repeating pattern | Crystal |