How did the volcanoes in the Ring of Fire form?
A) One of Earth’s plates was forced under another plate.
B) Lava built up after it flowed slowly from a volcano's cone.
C) Earth's plates separated and pulled apart from one another.
Eliminate
D) A hot spot burned a hole through a thin spot in Earth's crust.

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.

Which group of algae is characterized by unicellular organisms and includes some members that would be better classified as zooflagellates? euglenophytes red algae sporozoans green algae