CHILD DEVELOPMENT PEDAGOGY

Detailed explanation-1: -Hydrothermal eruption-An eruption driven by the heat in a hydrothermal system. Hydrothermal eruptions pulverise surrounding rocks and can produce ash, but do not include magma. Phreatic eruption-An eruption driven by the heat from magma interacting with water.

Detailed explanation-2: -Explosive eruptions produce ash All explosive volcanic eruptions generate tephra, fragments of rock that are produced when magma or or rock is explosively ejected. The largest fragments, blocks and bombs (>64 mm, 2.5 inches diameter), can be expelled with great force but are deposited near the eruptive vent.

Detailed explanation-3: -Introduction. Explosive volcanic eruptions that do not contain juvenile materials have been called by several names, e.g., steam, phreatic or hydrothermal eruption.

Detailed explanation-4: -Pyroclastic surges are low-density flows that leave thin but extensive deposits with cross-bedded layering. Ash flows leave deposits known as tuff, which are made up mainly of ash-sized fragments.