More than 50% of ecosystems are currently being used unsustainably. true or false

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

Drag each tile to the correct box. arrange the layers and faults from oldest to youngest.

Why does the earth spin slowly, not faster? is it possible to prove it scientifically? can you prove it with math?