Objective: Children will compare crustaceans to insects, learn about their dependence on salt water, and experiment with saltwater.
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Note: Assign each child a partner to work with to perform the experiment. For each partnership, mark one of the cups with an “S” to indicate the cup containing the salt water.
Crustaceans and insects are groups of animals that belong to a much larger group of animals called arthropods. Arthropods are animals that have segmented bodies, jointed legs, and a hard shell called an exoskeleton. Crustaceans, like insects, move from place to place by crawling; however, some crustaceans can swim. Crustaceans have 10 or more legs; insects have 6. Insects live all over the world in soil, trees, and water. Crustaceans usually live in or near the water. Most crustaceans that live in the water live in salt water. For instance, lobsters, crabs, and shrimp are found in the ocean. A few crustaceans, such as crayfish, live in fresh water. Fewer still, like wood lice, live on land. The largest and the smallest arthropods in the world are crustaceans.
Ocean water has a high concentration of salt in it, which makes it have more density than fresh water. Fresh water comes from rain and snow and is free from dissolved salt. Salt water is in oceans and seas and contains salt from millions of years ago that cannot escape. While fresh water evaporates, the salt in salt water stays in the water. Animals that live in salt water need salt water for food, stages of their development, and shelter. Although they need salt water for their survival, these animals have a special way of eliminating the excess salt from their bodies.
Visit the Delaware Museum of Natural History website
These lessons are aligned with the Common Core State Standards ("CCSS"). The CCSS provide a consistent, clear understanding of the concepts and skills children are expected to learn and guide teachers to provide their students with opportunities to gain these important skills and foundational knowledge.
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There are currently no Common Core Standards for pre-k, but these lessons are aligned as closely as possible to capture the requirements and meet the goals of Common Core Standards. However, these lessons were neither reviewed or approved by the National Governors Association Center for Best Practices or the Council of Chief State School Officers, which together are the owners and developers of the Common Core State Standards.