Maps and globes are drawn to scale and use symbols to represent topography and other features on Earth's surface. Grid lines on maps and globes are often used, with lines curving because the Earth is a sphere. The baselines for measuring distance on Earth are the equator and the Prime Meridian. Satellites are also often used as a mean to graph.
Pyroclastic textures occur when explosive eruptions blast the lava into the air resulting in fragmental, typically glassy material which fall as volcanic ash, lapilli and volcanic bombs.
