Who else is bored (-,-)

How do we determine if they are made with matter

When do you think it’s best to take the psat (what grade year / when in the year)?

Afish fossil is found in a rock. a foot bone and tooth are found in an older layer of the same rock. what can scientists learn from the rock? a) the area changed from land to water. b) the area changed from water to land. c) the area has always been land. d) the area was once an ocean.