This engaging Grade 4-5 science passage explores the fascinating world of dinosaurs, creatures that lived millions of years ago during the Mesozoic Era. Students will learn about key scientific concepts such as fossils, extinction, the differences between herbivores and carnivores, and the work of paleontologists. Important vocabulary words are highlighted and defined to build science literacy. The passage includes a real-world look at how fossils are discovered and studied, and ends with an interesting science fact. The resource aligns with NGSS standards and helps students practice reading comprehension, vocabulary, and critical thinking skills. Included are a Spanish translation, glossary, multiple-choice quiz, and writing activities that encourage students to explain scientific concepts, make connections to their own lives, and analyze cause and effect in nature. Audio integration is available to support different learning needs. Perfect for classroom or independent study.
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Dinosaur exhibits in the Indiana Dinosaur Museum, South Bend, Indiana. Image by CusterDome Wikimedia Commons
Dinosaurs were a group of reptiles that lived on Earth millions of years ago. They first appeared during the Mesozoic Era, which lasted from about 250 to 65 million years ago. Dinosaurs came in many shapes and sizes. Some were as small as chickens, while others, like the Brachiosaurus, were taller than a house!
Dinosaurs are divided into two main groups based on their diets. Herbivores were plant-eaters. They had flat teeth for chewing leaves and stems. Examples include Triceratops and Stegosaurus. Carnivores were meat-eaters. They had sharp teeth and claws to hunt other animals. Tyrannosaurus rex is a famous carnivore.
We know about dinosaurs because of fossils. Fossils are the remains or imprints of ancient living things. These can be bones, teeth, or even footprints, which have turned into rock over millions of years. Scientists called paleontologists study fossils to learn how dinosaurs lived, what they ate, and how they moved. Fossils are usually found in layers of rock. Finding and studying fossils helps us learn about Earth’s past.
Dinosaurs became extinct about 65 million years ago. Extinction means that all members of a group have died out. Scientists think a giant asteroid hit Earth, causing huge changes to the climate. Plants and animals could not survive, and the dinosaurs disappeared. Today, birds are considered by scientists to be the closest living relatives of dinosaurs.
Interesting Fact: Some dinosaur fossils have been found with evidence of feathers, showing that not all dinosaurs had scales!
What is a fossil?
Remains of ancient living thingsA type of plantA kind of dinosaurA scientist's tool
Which era did dinosaurs live in?
Mesozoic EraIce AgeStone AgeModern Era
What did carnivores eat?
MeatLeavesRocksWater
Why did dinosaurs become extinct?
Asteroid changed climateThey all got sickThey turned into birdsPlants disappeared
How do paleontologists learn about dinosaurs?
By studying fossilsBy reading storiesBy watching TVBy growing them
What does extinction mean?
All members die outA new animal is bornAn animal grows largerAnimals move to new places