| A | B |
|---|
| Age of Mammals | Cenozoic |
| Age of Reptiles | Mesozoic |
| Bowl-shaped regions that covers much of western North Dakota. | Williston Basin |
| Giant carnivorous lizard that lived in the ocean. | monasaur |
| gigantic sheet of ice thousands of feet thick | glacier |
| Liquid fossil fuel created from tiny plants & animals that lived in oceans. | petroleum |
| meat-eating animal | carnivore |
| molted material deep inside the Earth | magma |
| name of the gigantic lake left after the glacier melted for the last time | Lake Agassiz |
| plant-eating animal | herbivore |
| Red rock formed from lignite coal burning underground. | clinker |
| Rock formed by particles of sediment pressed together. | sedimentary rock |
| rock formed from magma | igneous rock |
| scientist who studies the Earth | geologist |
| Solid fossil fuel created from land vegetation. | coal |
| North Dakota State Fossil | petrified wood |
| The colorful southwestern part of North Dakota that has deep valleys, canyons, & cliffs. | Badlands |
| The first forests appeared during this era. | Paleozoic |
| the name of the last glacier to move over North Dakota. | Wisconsinan |
| the oldest era | Precambrian |
| the period we live in | Quarternary |
| The remains of a plant or animal that has been buried in the earth. | fossil |
| the scientific study of the Earth | geology |
| The type of soft coal found in North Dakota. | lignite |
| top layers of soil are scraped away and scooped up by giant shovel-type machines | surface-mining |
| a meat-eating flying reptile that lived in this area | pteranodon |
| large meat-eating dinosaur that lived in western North Dakota 65 million years ago | Tyrannosaurus Rex |
| was the most common dinosaur that lived in North Dakota | triceratops |
| fossil fuel created from tiny plants & animals that lived in oceans, squeezed by pressure, and exposed to heat for millions of years | natural gas |
| giant rock from outer space | asteroid |
