Objective: The purpose of this lab investigation is to guide students through several concepts that account for the salt found in oceans. First, students must understand that salt dissolves into water to make a solution. They must also understand the erosive nature of water, and its ability to weather and move things to other places. Last, they must know the fundamentals of the water cycle. Perfect for small groups and science stations!
So…why IS the ocean salty? Over time, water and rain wear down rocks on land and in bodies of water. These rocks contain minerals, like salt, that are washed into moving bodies of water like streams and rivers. The salt is eventually dumped into the ocean. Water evaporates from the ocean, and the salt is left behind. Since the water in the ocean doesn’t flow back IN to fresh water sources, the salt stays there.
Grade Level: 3rd-6th | Duration: 45-60 minutes
Concepts: Physical Science- Mixtures & Solutions, Earth Science- Weathering & Erosion, The Water Cycle
What's Included in this Lab Activity:
Why is the Ocean Salty? - Prediction Worksheet
Why is the Ocean Salty Investigation? - Guided Lab Procedures Worksheets (2)
Student Reflection Worksheet
Teacher Instructions WITH Lab Setup Photographs
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