1. The salt is added to one glass of water does not dissolve right away.
a. The water contains large amount of dissolved salt already
b. The water is cold and it needs stirring to dissolve the salt.
c. The salt is too hard to dissolve.
d. All of the above.

5. These rocks are found near a volcano.
a. It is formed from lava.
b. It will form sedimentary rocks in the future.
c. It will transform into metamorphic rock in the future.
d. None of the above

6. A passenger boat is over loaded with passengers.
a. The passengers are in a hurry.
b. The passengers are careless.
c. The boat might sink later.
d. Both A and B

7. The sky is dark.
a. It is night already.
b. The sky is full of nimbus clouds.
c. It is going to rain.
d. The sun is covered by clouds.

8. Which metric unit would you use to measure the distance a paper airplane can fly?
a. millimeters b. meters c. centiliters
d. kilograms

9. A dicotomous key is
a. A tool used to measure a capacity
b. A tool used by scientist to identify organisms or objects in nature.
c. Something used to catch a mouse
d. A tool to measure mass.​