2500000000000 in scientific notation

Asap 1. which surface feature of the moon is characterized by mountainous areas? question options: maria terrae regolith craters 2.which statement describes surface features called maria on the moon? question options: layers of dust and rock deep areas of cooled lava deep, rocky and barren valleys highlands and mountainous areas

The heliocentric and the geocentric models of the solar system included these central principles

What is friction? how does it affect the motion of an object?