Which of these reactions is an addition reaction? A.) H4C2+Br2 → H5C2Br + HBr
B.) H4C2 + HBr → H5C2Br
C.) H5C2CI+ NaOH → H5C20H + NaCl

When the earth was formed and cooled, why did nickel and iron end up in the center of the earth while basalt and granite ended up in the outer layers

This active feature of earth's crust in building mountain ranges as well as islands. this feature is a a) cavern. b) earthquake. c) mountain. d) volcano.

The rules of engagement (roe) working group is often used to (select all that apply.)