Turnover of Water in Temperate Lakes During the Spring and Fall

question 49

Multiple Choice

Turnover of water in temperate lakes during the spring and fall is caused by which of the following?

• A) warm, less dense water layered at the top
• B) cold, more dense water layered at the bottom
• C) a distinct thermocline between less dense, warm water and cold, dense water
• D) the changes in the density of water as seasonal temperatures change

---

Definitions:

Mesoderm

The middle layer of an embryo in early development, from which most of the body's tissues and structures are derived, including muscle, bone, and the circulatory system.

Ectoderm

The outermost of the three primary germ layers in the embryo, giving rise to the nervous system, skin, and various other tissues and organs.

Mesoderm

The mesoderm is the middle layer of an embryo in early development, giving rise to the musculoskeletal, circulatory, and other systems.

Thyroid

A gland in the neck that produces hormones regulating metabolism, growth, and development of the human body.