The diagram below shows an area with a trench. Trench
Oceanic crust
Continental crust
Modified from image courtesy of USGS
Which of the following best explains what is happening to the oceanic crust as it is pushed below the continental crust?
OA. The oceanic crust erodes when it collides with the continental crust.
OB. The oceanic crust joins with the continental crust.
OC.
The oceanic crust crystallizes when it dives below the continental crust.
OD.
The oceanic crust melts as it gets pushed below the continental crust.

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

plasma - state of matter made up of electrically charged particles