Search Results
Showing results 321 to 340 of 566
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-003-097.jpg?itok=5_q0XCmI)
What Color is Your Air Today?
Learners develop awareness and understanding of the daily air quality using the Air Quality Index (AQI) listed in the newspaper or online.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-004-570.gif?itok=YkusfK0J)
Food Webs
Source Institutions
In this activity, learners construct possible food webs for six different ecosystems as they learn about the roles of different kinds of living organisms.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-421.jpg?itok=f-7o8EsX)
Diatom Ooze: Ooze Clues
Source Institutions
In this activity, learners will plot the distribution of various oozes using information from sediment maps.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-253.png?itok=eSPWRIGR)
How Long Can You Hold Your Breath?
Source Institutions
In this activity (on page 142 of the PDF), learners will compare breathing rates before and after hyperventilation to explore how reduced carbon dioxide levels in the blood lower the need to breathe.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-384.jpg?itok=b3L2gs0q)
Of Cabbages and Kings
Source Institutions
This lesson gives full instructions for making cabbage juice indicator, a procedure sheet for learners to record observations as they use the indicator to test materials, and extension activities to d
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-003-054.png?itok=h2xUD9DO)
Classroom Dinosaur Dig
Source Institutions
In this activity, learners participate in a simulated dig to discover fossilized dinosaur bones. Learners take notes, make a map and propose theories about dinosaurs.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-910.jpg?itok=YWyy9oim)
How Fast Can a Carrot Rot?
Source Institutions
Learners design their own experiment to determine conditions that either help or hinder the decomposition of carrots by soil microbes.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-000-356.png?itok=wcogxKNE)
Invisible Sunblock
Source Institutions
This is a hands-on activity exploring how nanoscale particles are used in mineral sunblocks to increase their transparency.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-627.jpg?itok=kBjr9aRt)
Shapes and Colors and Textures, Oh My!
Source Institutions
This is an activity about discovering the colors and beauty of nature. Learners will spend time outdoors, matching paint chip samples, colored paper, or colors of clothing to those found in nature.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-141.jpg?itok=4vQT50OB)
Leaf it to Me
Source Institutions
In this activity, learners observe the effect of transpiration as water is moved from the ground to the atmosphere.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-000-578.png?itok=n5fKySp8)
Estuaries
Source Institutions
An estuary is a body of water that is created when freshwater from rivers and streams flows into the saltwater of an ocean.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-407.jpg?itok=hhLVUNqt)
Gene Switches
Source Institutions
In this activity, learners explore how genetic switches function and the role of genetic switches in the process of evolution.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-858.jpg?itok=ZN7m_fgS)
Not Just A Bag Of Beans
Source Institutions
In this activity, learners count and measure kidney beans to explore natural selection and variation. Learners measure the length of 50-100 beans.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-004-582.gif?itok=PVHWP5vY)
Magnifying and Observing Cells
Source Institutions
In this activity related to microbes, learners make slides of cells from an onion skin and Elodea (American or Canadian waterweed) to observe under a microscope.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-004-160.jpg?itok=48z-YJHY)
A Simply Fruity DNA Extraction
Source Institutions
In this activity, learners extract DNA from a strawberry and discover that DNA is in the food they eat.
The Sharp Eyes of a Naturalist
Source Institutions
In this creative activity, learners will practice looking carefully to observe details and to become familiar with dioramas as a method for displaying naturalistic scenes.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-860.jpg?itok=sGHMpeb1)
Shoebox Dinosaur Dig Site
Source Institutions
In this activity, (on page 6 of the PDF under SciGirls Activity: Dinosaurs) learners participate in a hands-on fossil excavation.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-753.jpg?itok=QKFPvVKk)
Free-living and Plant-Parasitic Nematodes (Roundworms)
Source Institutions
This lesson introduces learners to the world of nematodes (roundworms).
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-790.jpg?itok=4IQ46Jtn)
Tobacco Mosaic Virus
Source Institutions
In this four-part laboratory exercise, learners investigate properties of Tobacco mosaic virus (TMV) including (1) symptoms induced by the virus in susceptible plants at the macroscopic and microscopi
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-653.gif?itok=7YAwxQ9s)
Life Size: Line 'em up!
Source Institutions
In this activity on page 1 of the PDF, learners compare the relative sizes of biological objects (like DNA and bacteria) that can't be seen by the naked eye.