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A small, rounded lump of a mineral or mixture of minerals that is distinct from and usually harder than the surrounding rock or sediment. Nodules often form by replacement of a small part of the rocks in which they form.

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How does a geode form?

A geode forms in a pocket or hollow circular shaped opening in sedimentary or igneous rock. The opening could be created by a gas bubble, a rotted organism, or by other means. Mineral filled solutions seep into the opening and gradually form crystals from the hole lining inward. If the hole completely infills, it becomes a nodule. Because the minerals that form inside the pockets are often silicate, they are resistant to weathering. This means that the rock surrounding the pocket may not be as resistant to weathering as the geode pocket. Once the surrounding rock has weathered and eroded, what remains on the surface is the geode or nodule. Once an empty circular shaped hole it is now a rock formation unto itself.


What is a geode with flint in it?

A geode with flint inside would be a type of geode that contains the mineral flint, a hard, sedimentary cryptocrystalline form of the mineral quartz. Geodes are typically round rock formations that contain hollow cavities lined with crystals or mineral deposits, and finding flint inside one would be an uncommon but interesting occurrence.


A life-form in the Precambrian time was?

One example of a life-form in the Precambrian time was cyanobacteria, which are ancient photosynthetic bacteria thought to be one of the earliest forms of life on Earth. Cyanobacteria played a crucial role in the Great Oxygenation Event by producing oxygen as a byproduct of photosynthesis, which significantly altered Earth's atmosphere.


What is the state of matter of hydrogen chloride at room temperature?

Hydrogen chloride is a gas at room temperature and pressure.


What is symbiotic nitrogen fixation?

Nitrogen fixation occurs in leguminous plant that have nitrogen fixing bacteria in the root nodule. The plants utilize the nitrogen from the nitrogen fixing bacteria. The bacteria utilize plant sugars formed via photosynthesis.

Related Questions

How manganese nodule form?

They are formed in oceans as a result of pelagic sedimentation or precipitation


What is an isthmal nodule found in the thyroid gland?

It is a mistake. The isthmus of the thyroid gland is a thin bridge across the trachea, linking the right and left lobes. It occasionally also gives rise to the pyramidal lobe, a normal variant of thyroid anatomy. The adjectival form of isthmus is isthmic, so a nodule in the thyroid isthmus is an isthmic nodule, not an isthmal nodule.


What plants does have root nodule?

they have got a root nodule


Who nodule is more dangerous hot nodule or cold nodule?

Only a doctor can order the tests to determine if any thyroid nodule is dangerous. A thyroid uptake scan will help your doctor determine if your thyroid is hot (active) or cold (inactive).


What is a singer's nodule?

A singer's nodule, also known as a screamer's nodule or a teacher's nodule, is a small, inflammatory or fibrous growth on the vocal cords. It typically occurs in people who constantly strain their voices.


What is a benign fatty and yellowish nodule?

A benign fatty yellowish nodule is called a tumor.


What does it mean if a thyroid nodule is vascular?

There's blood supply inside of it not just leading to it


What do you call a small hard nodule on the body?

chancre is a term for a small hard nodule on body.


What does a isoechoic nodule with partial hypoechoic halo mean in a thyroid ultrasound?

What is Hypoechoic to Isoechoic Nodule


What is a description for lung nodule?

The term "lung nodule" is the most commonly used description for such medical conditions. A lung nodule is usually noncancerous and does not exceed three centimeters. Any growth beyond that is a mass rather than nodule and is more likely to be a cancer.


What is the relation between a nodule and a tumor?

A nodule more than 2 cm in diameter is called a tumor.


What is the medical term meaning yellow nodule or mass?

A xanthoma is a yellow nodule or mass. The plural is xanthomata.