What do thick spaces between tree rings indicate?

In russia which of these challenges affects the transportation of both petroleum products and other goods?

The action of eventually a low island to form. a. wind b. waves c. volcanoes d. tectonic plates

How does rain water cause erosion and deposition? a. when acidic water soaks into the ground, water dissolves limestone, resulting in the formation of caves. b. when a river overflows it moves downhill resulting in the formation of caves. c. when it rains, water flows into rivers and streams and moves back to land, resulting in the formation of caves. d. when water empties into lakes, sediment is deposited, resulting in formation of caves.