A composite volcanic cone, also known as a stratovolcano, gets its name from the alternating layers or sheets of lava and pyroclastic materials that form its structure. These cones are formed by repeated eruptions over time, with each eruption depositing layers of lava and volcanic ash.

Option 1 states that a composite volcanic cone is called a strata cone because of the alternating sheets of lava and pyroclastic materials. This is the correct answer. The layers of lava and pyroclastic materials give the cone a stratified appearance, similar to the layers, or strata, found in rocks or sedimentary deposits.

Option 2, uneven streams of lava flow, is not the correct answer. While composite volcanoes may have uneven lava flows, this is not the reason why they are called strata cones.

Option 3, cataclysmic eruption, is not the correct answer. While composite volcanoes can have explosive eruptions, this is not the characteristic that defines them as strata cones.

Option 4, eruption of lava flow from a fissure, is not the correct answer. Composite volcanoes are not typically associated with fissure eruptions, where lava flows from a long crack in the Earth`s surface.

Therefore, the