The northern portion of canada is covered by boreal forests, which are charcterized by: a: replant rows of oak trees. b: thickly grown rain forests. c: dense coverings of pine trees. d: sparsley placed decidious trees

As the earth formed, the force of gravity increased due to increased mass. what effect did this increased gravity have on the forming planet? the planet started to cool and an atmosphere formed. the planet started to become round and heat up. the planet started to wobble and turned upside down. the planet started to compress rock and form more radioactive elements.