The correct answer is Shield volcano.Shield VolcanoesA shield volcano is characterized by gentle upper slopes (about 5o) and somewhat steeper lower slopes (about 10o). Shield volcanoes are composed almost entirely of relatively thin lava and are built by many layers over time and the layers are usually of very similar composition. Hence, Option 1 is correct.Most shields were formed by low viscosity basaltic magma that flows easily downslope away from the summit vent. The low viscosity of the magma allows the lava to travel downslope on a gentle slope, but as it cools and its viscosity increases, its thickness builds upon the lower slopes giving a somewhat steeper lower slope.Most shield volcanoes have a roughly circular or oval shape in map view.Very little pyroclastic material is found within a shield volcano, except near the eruptive vents, where small amounts of pyroclastic material accumulate as a result of fire fountaining events. They are not very steep but are far and wider. They extend to great height as well as distance.They are the largest of all volcanoes in the world as the lava flows to a far distance.The Hawaiian volcanoes are the most famous examples.?Additional InformationCinder Cone Volcanoes:Cinders are extrusive igneous rocks. A more modern name for cinder is Scoria.Small volcanoes.These volcanoes consist almost entirely of loose, grainy cinders and almost no lava.They have very steep sides and usually have a small crater on top.Composite Volcanoes:Composite volcanoes, also called stratovolcanoes, are cone-shaped volcanoes built from many layers of lava, pumice, ash, and tephra.Volcanologists call these ‚¬Å“strato-‚¬ or composite volcanoes because they consist of layers of solid lava flows mixed with layers of sand- or gravel-like volcanic rock called cinders or volcanic ash.They are characterized by the eruption of cooler and more viscous lavas than basalt.