Answer:
Potassium = Great conductor of heat and electricity
Neon = Non reactive
Boron = has properties of both metals and non metals
Barium = Malleable and highly reactive
Explanation:
Potassium = Great conductor of heat and electricity
Potassium is soft metal and has low melting point. It is white silvery luster with great heat conducting properties.
Neon = Non reactive
Neon is present in group eighteen. It is noble gas. Its outer electronic shell is completely filled that's why it is non reactive.
Boron = has properties of both metals and non metals
Boron is metalloid and behave like both metals and non metals.
Barium = Malleable and highly reactive
Barium is belong to group 2A. It is alkaline earth metal. It is highly reactive towards other elements such as oxygen, fluorine, chlorine , etc.
The evidence of seafloor spreading from the choices given are;
- Molten material
- Magnetic stripes
- Drilled core samples
<h2>Further Explanation;</h2><h3>Seafloor spreading </h3>
- Seafloor spreading is a geological process that involves the gradual addition of new oceanic crust in the oceanic floor while moving older rocks away from the mid-oceanic ridge. In other words, it is the process in which the tectonic plates on the oceanic floor move apart from each other.
- The process occurs when the seafloor spreads apart along divergent boundaries and forms the mid-ocean ridge.
- Magma is pushed up through cracks in the crust along the mid-ocean ridge. As the magma is thrust up and hardens it forms the new crust and the ocean floor on both sides of the mid-ocean ridge move outward.
<h3>Evidence of seafloor spreading </h3>
1. Rocks near mid-ocean ridge were younger than rock near trenches. Rocks away from the mid-oceanic ridges are relatively older than those near it.
Additionally, the older rocks are denser and thicker compared to thinner and less dense rocks near the mid-oceanic ridge.
2. Matching bands of magnetic rocks were found on either side the mid-ocean ridge; bands like tree rings - record changes in earth's magnetic field over time.
This means sea floor contains different rocks based on ages and are positioned equally in opposite directions. This indicates that there is constant movement and spreading of rocks on the ocean floor.
3. Earthquake data showed oceanic crust is sinking on to the mantle at trenches.
Keywords: Seafloor spreading, evidence of seafloor spreading
<h3>Learn more about;</h3>
Level: High school
Subject: Geography
Topic: Geology
Sub-topic: Seafloor spreading
Answer:
Oxygenic photosynthesis
Explanation:
The process of oxygenic photosynthesis in which organisms use atmospheric carbon dioxide and fix it in the presence of sunlight into the organic nutrients led to the transition of anaerobic conditions on the primitive earth into the aerobic ones.
The oxygenic photosynthesis uses a water molecule as an electron donor. The water molecule is oxidized and oxygen gas is released as a by-product. This process led to the accumulation of oxygen in the atmosphere of the primitive earth.
The answer is Myosotis spp
Answer:
B. Carrier proteins
Explanation:
Water-soluble materials, such as glucose, amino acids, and ions, need help to cross the membrane because they are repelled by the hydrophobic tails of the phospholipid bilayer. The tails are not hydrophilic.
Endocytosis vesicles are an example of active transport, they require energy to allow large molecules to be taken into the cell through a system of vesicles.
Golgi complex vesicles deliver proteins and other macromolecules outside of the cell from the inside.
Carrier proteins can participate in both active and passive transport across cell membranes. For example, carrier proteins with channels can help molecules cross the membrane passively.