St. Elizabeth Ann Seton - Wichita, KS

DSWO WEEK 17 2018

 

DSWO WEEK 17

 

 

 

1-3-18     Earth – earth’s crust – inferring

Granite consists of quartz, feldspar, mica and iron that fused as molten rock and eventually hardened.  Many buildings have granite foundations and walls.  Why is granite a good building material?

 

1-4-18    Physical – Matter – interpreting data

Water molecules are electrically charged, and wax (oil) molecules are not.  An electrical charge can cause attraction between molecules.  Why does rain bead up on a freshly waxed car?

 

Answers:

 

 

1-3-18   The variety of materials in granite makes it strong yet relatively light.  This is because the crystals of granite have air in them, making them porous, yet the iron content provides sturdiness.  These characteristics allow granite to be transported and shaped fairly easily yet it does not easily collapse.

 

1-4-18  There is attraction between water molecules and very little attraction between water molecules and the molecules of a coating of auto wax.  Therefore, the water molecules cling to each other and push away from the wax to make beads of water that roll off the surface of the car.

 

DSWO WEEK 18

DSWO WEEK 18

1-8     Life – Health – hypothesizing

What is a doctor looking for when he or she feel s the sides of your neck?

1-9     Physical – Forces – cause/effect

Why does your stomach feel as if it is falling when an elevator first starts to go up?

1-10  Life – Human body – draw conclusion

Why do humans haves eyes on the fronts of their faces as dogs and cats do, instead of on the sides of their faces as horse, deer and squirrels do?

1-11     Physical – Sound – interpreting data

What does motion have to do with sound?

Answers:

1-8     By feeling the sides of your neck, your doctor can tell whether the lymph nodes in your neck are swollen.  Your arm pits, neck and groin contain hundreds of tiny structures called lymph nodes.  The nodes produce special infection-fighting white blood cells called lymphocytes.  When you are ill, your lymph nodes become swollen because they are producing extra lymphocytes.  By checking these in your neck, your doctor can tell you have an infection without taking a blood sample.

 

1-9     Objects tend to stay at rest if they are stationary and to continue moving once they are in motion until something stops them.  This property, inertia, means that when an elevator starts to move up, your stomach and other organs try to stay where they are as the outside of your body begins to move up.  Thus, you have the sensation that your stomach is being pulled down as the rest of you moves upward.  (Newton’s first law of motion.)

 

1-10   With eyes on the front of their faces, humans and other predators have stereoscopic vision.  That is, their two eyes work together to detect the shape and distance of prey.  Many animals that are prey have eyes on the sides of their heads.  Without stereoscopic vision, they cannot tell exactly how far away things are, but they can see in many directions at once.  Seeing in many directions helps them escape predators.

 

1-11     A vibrating object produces sounds by moving the air that is near it.  The motion is transferred to air farther out from the source of the sound.  This motion eventually reaches the air near a person’s ear drum causing the eardrum to vibrate.  The vibrations of the eardrum send signals to the brain and the brain interprets them as sound.