6. A valley is a low area of land between hills or mountains. How are valleys formed?
F water or glacier erosion
Gwind erosion
I layers of sand and mud are deposited
hurricanes destruct the land

What is driving behind plate tectonics (plate movment)? a) gravity only b) inertia c) convection and gravity d) the sun theres no option for science so i picked chemistry. plz

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?

Ajet plane is speeding down the runway during takeoff. air resistance is not negligible. identify the forces on the jet.