Oceans contain 97% of the water on the Earth and are home to a huge number of living creatures. Most of these creatures, about 90% of them, live near the water’s surface, where the pressure is not so great and they can get some light.
The classroom resource provides a slide show that will explain why the ocean is salty and describe different organisms that live in the ocean. There is also a short test that can be used to assess students' understanding.
Most people have heard Earth referred to as "the water planet." With that name comes the rightful image of a world with plentiful water. In photographs taken from space, we can see that our planet has more water than land. However, of all the water on Earth, more than 99 percent of Earth's water is unusable by humans and many other living things - only about 0.3 percent of our freshwater is found in the surface water of lakes, rivers, and swamps. The teacher guide describes our current understanding of water cycling and freshwater issues that affect natural and human communities.
The teacher will present an informational text from the website, ReadWorks. Students will interact with this non-fiction text by annotating the text digitally. The students will answer the questions associated with the article as an assessment. This learning activity will describe the freshwater distribution on the Earth's surface and provide a graphical representation of freshwater reservoirs. This activity can serve as reinforcement after students have already learned this concept or be used as an assessment at the conclusion of a lesson.