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© Cheryl Lazarus
A Dinosaur Unit Study - Lesson 7
reprinted with permission
Yarn or string
Book: How Big Were the Dinosaurs
Open with prayer - and read the memory verse together (even if the children have it memorized now):
And God created great whales, and every living creature that moveth…. Genesis 1:21a
Begin today by having the children summarize, in their own words what has happened so far in the Bible stories we have already read. Discuss anything they have over-looked or forgotten.
Read Genesis chapter 6:1-15. Stop at verse 15 and explain what measurement a cubit is (i.e. 18 inches). Get out a ruler and have the children measure a piece of yarn or string 18 inches long and cut it. Since their ruler is only 12" long, you will have to show them how to mark and continue measuring. They will use this skill again tomorrow, so cover it until it is understood. Read verse 15 again and point out that the length of the ark would be equal to 300 pieces of that length of yarn. Continue reading through verse 16, stop and point out that it was 3 stories high. See if they can think of, or recall a 3-story building they have seen. Continue reading to the end of the chapter.
That ark was really big and it carried a lot of weight - could it really float? Let's do an experiment. Take two pieces of foil of equal size. Roll one piece into a ball, making it as tight as possible. Have child use small hammer or other blunt tool to pound the rolled piece of foil (the idea is to get all of the air out of the foil). Use the other piece of foil and shape it into the form of a boat (or rectangle with upturned sides will due.) Both are made of the same material, and weigh the same. Each is now just shaped differently. Will both pieces of foil float? Have children write down what they think will happen and why. When they are done fill up sink with water and put the "boat" in, it floats. Now drop in the ball of foil - it sinks straight to the bottom. It's not the size that counts but how dense the object is. If it is denser than water, the object will sink. Since the foil ball is tightly packed together its density is more, so it sinks. But wait, we aren't done yet! The foil boat floats, but what if we put some things in it? First add a Lego or two, then more and more. Keep adding other small items until you get the boat to sink. If we have too much weight in the boat, it will sink. Explain how precise and incredible God's instructions to Noah were. God knew exactly how much weight was going to be in the ark, how many animals would be in the ark, how much food and supplies, etc. He knew exactly how big Noah's ark needed to be to keep from sinking! Noah was obedient to God and followed His directions carefully! It is always very important to do as God asks, for He always knows best!
Another experiment to check out density: Pour one-third cup of syrup into a glass jar. Then add one-third cup of cooking oil, followed by one-third cup of water. Ask children what they think will happen as you drop in your foil ball, then 1 plastic bread tie, etc. Try some other things you have around the kitchen too, like a raisin, small bean, and finally a penny. What happens? Why? (The syrup will stay on the bottom because it is denser than water or oil, the water will move to the middle, because water is denser than oil. The objects you drop in will sink to level of whichever liquid has a greater density than the object itself and will float at that level). Discuss & cleanup.
Have the children add the following words to their vocabulary list: (cubit / density / obedience)
Read How Big Were the Dinosaurs (3rd grade and advanced readers can read to you).
Thank the Lord for a wonderful day!!
On to LESSON 8