Biological weathering is caused by living organisms, such as microbes, animals, and plants. Water, oxygen, and rocks are nonliving things (though water and rocks may be capable of weathering), and only plant roots fits the definition of biological weathering. So the correct answer for #1 is A.
Frost wedging occurs when the little water content in rock freezes, expanding and forcing the rock apart. Eventually, enough freeze-melt cycles causes the rock to break apart little by little. This is due to ice's density being less than that of water, meaning that it is because water expands when frozen. So the answer to #2 is A.
<span>The resource curse, also known as the paradox of plenty, refers to the paradox
that countries with an abundance of natural resources (like fossil
fuels and certain minerals), tend to have less economic growth, less
democracy, and worse development outcomes than countries with fewer
natural resources.</span>
Tectonic plates are parts (pieces) of the outermost layer of Earth: the Crust. (the outermost part of the mantle is also often included in the plates). This means that the land in the middle of the plates is relatively stable while the borders of the plates can be in movement - after all this is where two pieces meet. Plate borders are where the vocanoes and Earthquakes often take place.
Because the orbital period and rotational period are the exact same.
The asthenosphere and the lithosphere are parts of the Earth's geosphere. The correct answer is A.
