What is a lava flow with a surface of rough, jagged blocks and sharp, angular projections called?

The hypothesis of continental drift states that earth's continents, which are located on tectonic plates, move relative to each other. which of the following is true of the movement of the tectonic plates? a. tectonic plates only move once every million years. b. they move at a rate of approximately 5 centimeters per year. c. tectonic plates never move, only the continents located on them do. d. their movements are very rapid and occur at random times.

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

The main ingredient of magma is a pahoehoe. b silca c dissolved gases d obsidian