What is one of the differences between the erosion of riverbeds and the erosion of glaciers?

the riverbed erodes into an l-shaped valley, whereas the glacier erodes into a w-shaped valley.
the riverbed erodes into a u-shaped valley, whereas the glacier erodes into a v-shaped valley.
the riverbed erodes into a v-shaped valley, whereas the glacier erodes into an l-shaped valley.
the riverbed erodes into a v-shaped valley, whereas the glacier erodes into a u-shaped valley.

The phlogiston theory in the 17th century attempted to explain burning. the theory stated that combustable objects contained a material called phlogiston, a substance without mass, color, odor, etc. after objects burned, the objects were dephlogistonated and were then in their true form. the phlogiston theory was accepted until the 18th century, when lavoisier proved that combustion requires a gas that has mass. phlogiston is considered a) to be scientific knowledge b) not to be scientific knowledge c) to be proven by scientific method d) to be accepted in the modern scientific community

What is the difference between an igneous, sedimentary and metamorphic rock

You find a fossil that you are sure shows evidence of bipedalism. you know this because which of the following anatomical traits is present? a. thighbones that angle in toward the knees b. a narrow pelvis c. opposable hallux d. posterior position of the foramen magnum