How Is an Alluvial Fan Formed

question 71

Multiple Choice

How is an alluvial fan formed?

• A)A stream erodes down through older terraces and entrenched meanders.
• B)Sediment is deposited by debris flows and streams that decrease in velocity along the mountain front.
• C)A landslide blocks the stream,causing sediment to accumulate upstream.
• D)A dam increases the speed of currents below the dam.

---

Definitions:

Homo Erectus

An extinct species of hominid that lived throughout most of the Pleistocene geological epoch, known for being one of the first hominins to exhibit modern human-like body proportions and behavior.

Homo Sapiens

The species name for modern humans, characterized by a capacity for complex language, symbolic thought, and social organization.

Neandertal

A member of an extinct species of human, closely related to modern humans, that lived in Europe and parts of Asia until about 40,000 years ago.

Acheulean Tool Tradition

An archaeological industry of stone tool manufacture characterized by distinctive oval and pear-shaped hand-axes associated with early humans.