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Below the top layer of the skin, the epidermis, is the dermis.
At the top of the dermis lies the papillary layer which connects with the deepest layer of the epidermis, the stratum germinativum. The papillary layer supplies blood and nutrients to the germinativum with lots of dermal papillae which form waves all along this layer. These waves form the ridges and valleys to form fingerprints which show on the epidermis.
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∙ 14y ago
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Which processes form ridges and valleys?
folding uplift and erosion
Which structures of the dermis give rise to friction edges or fingerprints?
Dermal ridges cause the overlying epidermis to form epidermal ridges. Collectively these ridges are called friction ridges.
What are ridges that form on the sides of glacial valleys as a glacier melts?
lateral moraine
When do fingerprints form?
Fingerprint ridges are formed during the third to fourth month of fetal development.
What are epidermal ridges and dermal papillae?
Epidermal Ridges: the ridges of the epidermis found in the palms and soles, where the sweat pores open; form in fetus as epidermis conforms to the dermal papillae aka fingerprints Dermal Papillae: finger like projections in the papillary region of the dermis where the epidermis conforms for fingerprints
What causes fingerprints?
Basically, a fingerprint left on a surface is caused because: Oils form on sweat glands in our fingers, collecting on ridges of a fingerprint. After touching something, the oils and other materials previously on the ridges are left behind on the surface you just touched. I hope that helps.
Friction ridges which form fingerprints begin to form?
The same time they form their fingers/hands in the womb
What causes vallyes to form?
How valleys are made
What causes U-shaped valleys to form?
Glaciers.
Why are fingerprints left on things you touch?
The oils and dirt on your skin stick to items that you touch. This causes fingerprints to form on most items.
Where do Rift zones rift valleys linear oceans and oceanic ridges features form?
They form in areas of the Earth in which continental or oceanic plates are pulling apart.
What cause ocean ridges to form?
earths crust causes it
